{"product_id":"seiko-original-gehausedichtung-o-ring-referenz-ob2290b-nos","title":"SEIKO Original Housing Gasket \/ O-Ring – Reference OB2290B (NOS)","description":"\u003ch3 data-start=\"438\" data-end=\"465\"\u003e\n\n \u003cstrong data-start=\"487\" data-end=\"541\" style=\"font-size: 0.875rem;\"\u003eOriginal SEIKO housing gasket (packing\/gasket)\u003c\/strong\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003ewith reference\u003c\/span\u003e \u003cstrong data-start=\"559\" data-end=\"569\" style=\"font-size: 0.875rem;\"\u003eB2290B\u003c\/strong\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e, supplied in the original SEIKO packaging.\u003c\/span\u003e\n\n\u003c\/h3\u003e\n\n \u003cp data-start=\"467\" data-end=\"768\"\u003eThis is an \u003cstrong data-start=\"642\" data-end=\"688\"\u003eunused NOS (New Old Stock) spare part\u003c\/strong\u003e from old stock, manufactured according to the SEIKO factory specifications of the time.\u003c\/p\u003e\n\n\u003cp data-start=\"770\" data-end=\"1044\"\u003e This seal was used by SEIKO for classic case designs and is particularly suitable for \u003cstrong data-start=\"881\" data-end=\"939\"\u003evintage SEIKO watches of the 1970s and early 1980s\u003c\/strong\u003e that use a \u003cstrong data-start=\"956\" data-end=\"982\"\u003eflat O-ring seal\u003c\/strong\u003e (e.g. snap-back or press-fit case).\u003c\/p\u003e\n\n\u003ch2 data-start=\"1051\" data-end=\"1084\"\u003e \u003cstrong data-start=\"1054\" data-end=\"1084\"\u003eTechnical specifications\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli data-start=\"1088\" data-end=\"1111\"\u003e\n\n \u003cstrong data-start=\"1088\" data-end=\"1103\"\u003eManufacturer:\u003c\/strong\u003e SEIKO\u003c\/li\u003e\n\n\u003cli data-start=\"1114\" data-end=\"1148\"\u003e\n\n \u003cstrong data-start=\"1114\" data-end=\"1139\"\u003eOriginal part number:\u003c\/strong\u003e B2290B\u003c\/li\u003e\n\n\u003cli data-start=\"1151\" data-end=\"1190\"\u003e\n\n \u003cstrong data-start=\"1151\" data-end=\"1163\"\u003eComponent:\u003c\/strong\u003e Housing seal \/ O-ring\u003c\/li\u003e\n\n\u003cli data-start=\"1193\" data-end=\"1224\"\u003e\n\n \u003cstrong data-start=\"1193\" data-end=\"1208\"\u003eProfile shape:\u003c\/strong\u003e Round (O-ring)\u003c\/li\u003e\n\n\u003cli data-start=\"1227\" data-end=\"1266\"\u003e \n\u003cstrong data-start=\"1227\" data-end=\"1248\"\u003eInner diameter:\u003c\/strong\u003e approx. \u003cstrong data-start=\"1253\" data-end=\"1264\"\u003e22.9 mm\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1269\" data-end=\"1312\"\u003e\n\n \u003cstrong data-start=\"1269\" data-end=\"1289\"\u003eSeal thickness:\u003c\/strong\u003e approx. \u003cstrong data-start=\"1294\" data-end=\"1310\"\u003e0.20–0.29 mm\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1315\" data-end=\"1362\"\u003e\n\n \u003cstrong data-start=\"1315\" data-end=\"1328\"\u003eMaterial:\u003c\/strong\u003e NBR (nitrile butadiene rubber)\u003c\/li\u003e\n\n\u003cli data-start=\"1365\" data-end=\"1385\"\u003e\n\n \u003cstrong data-start=\"1365\" data-end=\"1375\"\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\n\u003cli data-start=\"1388\" data-end=\"1439\"\u003e\n\n \u003cstrong data-start=\"1388\" data-end=\"1400\"\u003eCondition:\u003c\/strong\u003e New, unused (NOS – New Old Stock)\u003c\/li\u003e\n\n\u003cli data-start=\"1442\" data-end=\"1463\"\u003e\n\n \u003cstrong data-start=\"1442\" data-end=\"1455\"\u003eOrigin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\n\u003cli data-start=\"1466\" data-end=\"1533\"\u003e\n\n \u003cstrong data-start=\"1466\" data-end=\"1483\"\u003eScope of delivery:\u003c\/strong\u003e 1× original SEIKO seal in original packaging\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2 data-start=\"1540\" data-end=\"1574\"\u003e \u003cstrong data-start=\"1543\" data-end=\"1574\"\u003eUsage \/ Compatibility\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp data-start=\"1576\" data-end=\"1636\"\u003e This seal was used by SEIKO in, among other things:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli data-start=\"1640\" data-end=\"1690\"\u003e classic \u003cstrong data-start=\"1652\" data-end=\"1690\"\u003eSEIKO automatic and quartz models\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n \u003cli data-start=\"1693\" data-end=\"1736\"\u003eCases with \u003cstrong data-start=\"1706\" data-end=\"1736\"\u003esnap-back or press-fit\u003c\/strong\u003e bottoms\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1739\" data-end=\"1824\"\u003e Vintage models with \u003cstrong data-start=\"1760\" data-end=\"1824\"\u003eWP marking (Water Proof according to the then SEIKO standard)\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-start=\"1826\" data-end=\"1989\"\u003e ⚠️ \u003cstrong data-start=\"1829\" data-end=\"1841\"\u003eNote:\u003c\/strong\u003e\u003cbr data-start=\"1841\" data-end=\"1844\"\u003e Exact compatibility depends on the specific housing and its groove dimensions. Please check the diameter and seal thickness before installation.\u003c\/p\u003e\n\n\u003ch2 data-start=\"1996\" data-end=\"2052\"\u003e \u003cstrong data-start=\"1999\" data-end=\"2052\"\u003eExplanation of the SEIKO packaging code system (OB2290B)\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cp data-start=\"2054\" data-end=\"2227\"\u003e SEIKO used a \u003cstrong data-start=\"2090\" data-end=\"2127\"\u003estandardized coding system\u003c\/strong\u003e for seals, which allows the most important technical properties to be derived directly from the part number.\u003c\/p\u003e\n\n\u003ch3 data-start=\"2229\" data-end=\"2285\"\u003e \u003cstrong data-start=\"2233\" data-end=\"2285\"\u003e1. Profile \/ cross-section code (first letter)\u003c\/strong\u003e \u003c\/h3\u003e\n\n\u003cul data-start=\"2287\" data-end=\"2350\"\u003e\n\n\u003cli data-start=\"2287\" data-end=\"2350\"\u003e\n\n\u003cp data-start=\"2289\" data-end=\"2350\"\u003e \u003cstrong data-start=\"2289\" data-end=\"2307\"\u003eB = B型 (B type)\u003c\/strong\u003e\u003cbr data-start=\"2307\" data-end=\"2310\"\u003e → round seal, classic \u003cstrong data-start=\"2340\" data-end=\"2350\"\u003eO-ring\u003c\/strong\u003e\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003ch3 data-start=\"2357\" data-end=\"2393\"\u003e\n\u003cstrong data-start=\"2361\" data-end=\"2393\"\u003e2. Size code (sequence of numbers)\u003c\/strong\u003e \u003c\/h3\u003e\n\n\u003cul data-start=\"2395\" data-end=\"2561\"\u003e\n\n\u003cli data-start=\"2395\" data-end=\"2493\"\u003e\n\n\u003cp data-start=\"2397\" data-end=\"2493\"\u003e \u003cstrong data-start=\"2397\" data-end=\"2404\"\u003e229\u003c\/strong\u003e → Inner diameter \u003cstrong data-start=\"2424\" data-end=\"2435\"\u003e22.9 mm\u003c\/strong\u003e\u003cbr data-start=\"2435\" data-end=\"2438\"\u003e (SEIKO specifies the diameter in \u003cstrong data-start=\"2469\" data-end=\"2489\"\u003e0.1 mm increments\u003c\/strong\u003e ) \u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"2495\" data-end=\"2561\"\u003e\n\n\u003cp data-start=\"2497\" data-end=\"2561\"\u003e The last digit is used for internal classification\/tolerance class.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3 data-start=\"2568\" data-end=\"2610\"\u003e \u003cstrong data-start=\"2572\" data-end=\"2610\"\u003e3. Strength code (last letter)\u003c\/strong\u003e \u003c\/h3\u003e\n\n\u003cul data-start=\"2612\" data-end=\"2634\"\u003e\n\n\u003cli data-start=\"2612\" data-end=\"2634\"\u003e\n\n\u003cp data-start=\"2614\" data-end=\"2634\"\u003e \u003cstrong data-start=\"2614\" data-end=\"2634\"\u003eB = 0.20–0.29 mm\u003c\/strong\u003e\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-start=\"2636\" data-end=\"2705\"\u003e → very \u003cstrong data-start=\"2643\" data-end=\"2662\"\u003eflat gasket\u003c\/strong\u003e , typical for vintage case designs\u003c\/p\u003e\n\n\u003ch3 data-start=\"2712\" data-end=\"2739\"\u003e \u003cstrong data-start=\"2716\" data-end=\"2739\"\u003e4. Material \u0026amp; Color\u003c\/strong\u003e \u003c\/h3\u003e\n\n\u003cul data-start=\"2741\" data-end=\"2909\"\u003e\n\n\u003cli data-start=\"2741\" data-end=\"2909\"\u003e\n\n\u003cp data-start=\"2743\" data-end=\"2909\"\u003e Black SEIKO seals of this era are usually made of \u003cstrong data-start=\"2809\" data-end=\"2835\"\u003eNBR (nitrile rubber).\u003c\/strong\u003e\u003cbr data-start=\"2835\" data-end=\"2838\"\u003e → Good oil and aging resistance, true to the original for vintage watches\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2 data-start=\"2916\" data-end=\"2952\"\u003e \n\u003cstrong data-start=\"2919\" data-end=\"2952\"\u003eSummary of the coding\u003c\/strong\u003e \u003cstrong data-start=\"2919\" data-end=\"2952\"\u003e\u003c\/strong\u003e\n\n\u003c\/h2\u003e\n\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\n\u003cdiv class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\n\u003ctable data-start=\"1040\" data-end=\"1286\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\n\u003cthead data-start=\"1040\" data-end=\"1067\"\u003e\n\n\u003ctr data-start=\"1040\" data-end=\"1067\"\u003e\n\n\u003cth data-start=\"1040\" data-end=\"1054\" data-col-size=\"sm\"\u003e ingredient\u003c\/th\u003e\n\n\u003cth data-start=\"1054\" data-end=\"1067\" data-col-size=\"md\"\u003e Meaning \u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/thead\u003e\n\n\u003ctbody data-start=\"1078\" data-end=\"1286\"\u003e\n\n\u003ctr data-start=\"1078\" data-end=\"1134\"\u003e\n\n\u003ctd data-start=\"1078\" data-end=\"1086\" data-col-size=\"sm\"\u003e \u003cstrong data-start=\"1080\" data-end=\"1085\"\u003eO\u003c\/strong\u003e\n\u003c\/td\u003e\n\n\u003ctd data-start=\"1086\" data-end=\"1134\" data-col-size=\"md\"\u003e O-ring (round seal, additional marking) \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-start=\"1135\" data-end=\"1173\"\u003e\n\n\u003ctd data-start=\"1135\" data-end=\"1143\" data-col-size=\"sm\"\u003e \u003cstrong data-start=\"1137\" data-end=\"1142\"\u003eB\u003c\/strong\u003e\n\u003c\/td\u003e\n\n\u003ctd data-start=\"1143\" data-end=\"1173\" data-col-size=\"md\"\u003e B-type = round cross-section \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-start=\"1174\" data-end=\"1212\"\u003e\n\n\u003ctd data-start=\"1174\" data-end=\"1184\" data-col-size=\"sm\"\u003e \u003cstrong data-start=\"1176\" data-end=\"1183\"\u003e229\u003c\/strong\u003e\n\u003c\/td\u003e\n\n\u003ctd data-start=\"1184\" data-end=\"1212\" data-col-size=\"md\"\u003e 22.9 mm inner diameter \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-start=\"1213\" data-end=\"1254\"\u003e\n\n\u003ctd data-start=\"1213\" data-end=\"1221\" data-col-size=\"sm\"\u003e \u003cstrong data-start=\"1215\" data-end=\"1220\"\u003e0\u003c\/strong\u003e\n\u003c\/td\u003e\n\n\u003ctd data-start=\"1221\" data-end=\"1254\" data-col-size=\"md\"\u003e Internal size\/serial number \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-start=\"1255\" data-end=\"1286\"\u003e\n\n\u003ctd data-start=\"1255\" data-end=\"1263\" data-col-size=\"sm\"\u003e \u003cstrong data-start=\"1257\" data-end=\"1262\"\u003eB\u003c\/strong\u003e\n\u003c\/td\u003e\n\n\u003ctd data-start=\"1263\" data-end=\"1286\" data-col-size=\"md\"\u003e Thickness 0.20–0.29 mm \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\u003c\/div\u003e\n\n\u003ch2 data-start=\"3104\" data-end=\"3125\"\u003e\u003c\/h2\u003e\n\n\u003ch2 data-start=\"3104\" data-end=\"3125\"\u003e \u003cstrong data-start=\"3107\" data-end=\"3125\"\u003eSpecial features\u003c\/strong\u003e\n\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli data-start=\"3129\" data-end=\"3182\"\u003e\n\n \u003cstrong data-start=\"3129\" data-end=\"3160\"\u003eGenuine SEIKO spare part\u003c\/strong\u003e , not a reproduction\u003c\/li\u003e\n\n\u003cli data-start=\"3185\" data-end=\"3244\"\u003e\n\n \u003cstrong data-start=\"3185\" data-end=\"3201\"\u003eNOS quality\u003c\/strong\u003e – ideal for authentic restorations\u003c\/li\u003e\n\n\u003cli data-start=\"3247\" data-end=\"3316\"\u003e Suitable for \u003cstrong data-start=\"3259\" data-end=\"3290\"\u003eperiod-correct servicing\u003c\/strong\u003e of vintage SEIKO watches\u003c\/li\u003e\n\n\u003cli data-start=\"3319\" data-end=\"3373\"\u003e Preservation of the original case design and fit\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003ch2 data-start=\"3380\" data-end=\"3416\"\u003e\u003cstrong data-start=\"3383\" data-end=\"3416\"\u003eNote regarding water resistance\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp data-start=\"3418\" data-end=\"3579\"\u003e Installing a new seal does \u003cstrong data-start=\"3457\" data-end=\"3497\"\u003enot guarantee watertightness\u003c\/strong\u003e .\u003cbr data-start=\"3502\" data-end=\"3505\"\u003e A \u003cstrong data-start=\"3545\" data-end=\"3568\"\u003eleak test\u003c\/strong\u003e is generally recommended after installation.\u003c\/p\u003e","brand":"Vintage \u0026 JDM (Japan Domestic Market)","offers":[{"title":"Default Title","offer_id":52264507703634,"sku":null,"price":14.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/D5A2B40B-36F0-478A-A066-20EEC2494449.jpg?v=1765632961","url":"https:\/\/japanese-microbrands.com\/en\/products\/seiko-original-gehausedichtung-o-ring-referenz-ob2290b-nos","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}