{"product_id":"seiko-original-dichtung-gasket-1-stuck-ref-oh2300b01-736-nos","title":"Seiko Original Gasket (1 piece) – Ref. OH2300B01 - 768 - NOS","description":"\u003cp data-end=\"671\" data-start=\"349\"\u003eThis original Seiko gasket is from old stock (New Old Stock) and was originally supplied by \u003cstrong data-end=\"480\" data-start=\"453\"\u003eHattori Seiko Co., Ltd.\u003c\/strong\u003e in Japan. It serves as a \u003cstrong data-end=\"537\" data-start=\"518\"\u003ecase gasket\u003c\/strong\u003e (O-ring) to seal the watch case and is specifically designed for classic Seiko models with the corresponding case dimensions.\u003c\/p\u003e\n\n\u003ch3 data-end=\"708\" data-start=\"678\"\u003e Technical specifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"761\" data-start=\"712\"\u003e\n\n \u003cstrong data-end=\"727\" data-start=\"712\"\u003eManufacturer:\u003c\/strong\u003e Seiko (Hattori Seiko Co., Ltd.)\u003c\/li\u003e\n\n\u003cli data-end=\"792\" data-start=\"764\"\u003e\n\n \u003cstrong data-end=\"780\" data-start=\"764\"\u003ePart number:\u003c\/strong\u003e 768 - OH2300B01\u003c\/li\u003e\n\n\u003cli data-end=\"844\" data-start=\"795\"\u003e\n\n \u003cstrong data-end=\"807\" data-start=\"795\"\u003eComponent:\u003c\/strong\u003e Case Back Gasket\u003c\/li\u003e\n\n\u003cli data-end=\"879\" data-start=\"847\"\u003e\n\n \u003cstrong data-end=\"863\" data-start=\"847\"\u003eCross-section:\u003c\/strong\u003e round (O-ring)\u003c\/li\u003e\n\n\u003cli data-end=\"902\" data-start=\"882\"\u003e\n\n \u003cstrong data-end=\"892\" data-start=\"882\"\u003eColor:\u003c\/strong\u003e black\u003c\/li\u003e\n\n\u003cli data-end=\"997\" data-start=\"905\"\u003e\n\n \u003cstrong data-end=\"918\" data-start=\"905\"\u003eMaterial:\u003c\/strong\u003e original Seiko specification (synthetic elastomer, factory defined)\u003c\/li\u003e\n\n\u003cli data-end=\"1052\" data-start=\"1000\"\u003e \n\u003cstrong data-end=\"1012\" data-start=\"1000\"\u003eCondition:\u003c\/strong\u003e NOS (unused, original packaging)\u003c\/li\u003e\n\n\u003cli data-end=\"1080\" data-start=\"1055\"\u003e\n\n \u003cstrong data-end=\"1072\" data-start=\"1055\"\u003eScope of delivery:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3 data-end=\"1134\" data-start=\"1087\"\u003e Dimensions (decoded from the part number)\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"1173\" data-start=\"1138\"\u003e\n\n \u003cstrong data-end=\"1159\" data-start=\"1138\"\u003eInner diameter:\u003c\/strong\u003e \u003cstrong data-end=\"1171\" data-start=\"1160\"\u003e23.0 mm\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli data-end=\"1216\" data-start=\"1176\"\u003e\n\n \u003cstrong data-end=\"1204\" data-start=\"1176\"\u003eMaterial thickness (width):\u003c\/strong\u003e \u003cstrong data-end=\"1216\" data-start=\"1205\"\u003e0.50 mm\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-end=\"1312\" data-start=\"1218\"\u003e These dimensions are crucial for proper sealing and should be adhered to exactly.\u003c\/p\u003e\n\n\u003ch2 data-end=\"1370\" data-start=\"1319\"\u003e Explanation of the Seiko seal code \u003cstrong data-end=\"1370\" data-start=\"1357\"\u003eOH2300B01\u003c\/strong\u003e\n\n\u003c\/h2\u003e\n\n\u003cp data-end=\"1505\" data-start=\"1372\"\u003e Seiko uses a systematic coding scheme for its seals. The part number \u003cstrong data-end=\"1469\" data-start=\"1456\"\u003eOH2300B01\u003c\/strong\u003e can be broken down as follows:\u003c\/p\u003e\n\n\u003ch3 data-end=\"1537\" data-start=\"1507\"\u003e 1. \u003cstrong data-end=\"1519\" data-start=\"1514\"\u003eO\u003c\/strong\u003e – Cross Section\u003c\/h3\u003e\n\n\u003cp data-end=\"1559\" data-start=\"1538\"\u003e → Round profile \/ O-ring\u003c\/p\u003e\n\n \u003ch3 data-end=\"1602\" data-start=\"1561\"\u003e2. \u003cstrong data-end=\"1573\" data-start=\"1568\"\u003eH\u003c\/strong\u003e – Latitude or Thickness Code\u003c\/h3\u003e\n\n\u003cp data-end=\"1684\" data-start=\"1603\"\u003e → \u003cstrong data-end=\"1616\" data-start=\"1605\"\u003e0.50 mm\u003c\/strong\u003e material thickness\u003cbr data-end=\"1634\" data-start=\"1631\"\u003e (H-code corresponds to a thickness range of 0.50–0.59 mm)\u003c\/p\u003e\n\n\u003ch3 data-end=\"1716\" data-start=\"1686\"\u003e 3. \u003cstrong data-end=\"1701\" data-start=\"1693\"\u003e2300\u003c\/strong\u003e – Size code\u003c\/h3\u003e\n\n\u003cp data-end=\"1786\" data-start=\"1717\"\u003e → \u003cstrong data-end=\"1748\" data-start=\"1719\"\u003e23.00 mm inner diameter\u003c\/strong\u003e\u003cbr data-end=\"1751\" data-start=\"1748\"\u003e (Measurements always given in 1\/10 mm increments)\u003c\/p\u003e\n\n\u003ch3 data-end=\"1813\" data-start=\"1788\"\u003e 4. \u003cstrong data-end=\"1800\" data-start=\"1795\"\u003eB\u003c\/strong\u003e – Color code\u003c\/h3\u003e\n\n\u003cp data-end=\"1823\" data-start=\"1814\"\u003e → Black\u003c\/p\u003e\n\n\u003ch3 data-end=\"1871\" data-start=\"1825\"\u003e \u003cstrong data-end=\"1838\" data-start=\"1832\"\u003e5.01\u003c\/strong\u003e – Serial or revision number\u003c\/h3\u003e\n\n\u003cp data-end=\"1916\" data-start=\"1872\"\u003e → Internal Seiko reference (no change in dimensions)\u003c\/p\u003e\n\n\u003cp data-end=\"1940\" data-start=\"1918\"\u003e \u003cstrong data-end=\"1938\" data-start=\"1918\"\u003eIn summary:\u003c\/strong\u003e \u003c\/p\u003e\n\n\u003cblockquote data-end=\"2008\" data-start=\"1941\"\u003e\n\n\u003cp data-end=\"2008\" data-start=\"1943\"\u003e Black O-ring seal, 0.50 mm thick, 23.0 mm inner diameter\u003c\/p\u003e\n\n\n\u003c\/blockquote\u003e\n\n\u003ch3 data-end=\"2038\" data-start=\"2015\"\u003e Typical use\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"2063\" data-start=\"2042\"\u003e Seiko vintage watches\u003c\/li\u003e\n\n\u003cli data-end=\"2104\" data-start=\"2066\"\u003e Housing bases with approx. 23 mm sealing seat\u003c\/li\u003e\n\n\u003cli data-end=\"2168\" data-start=\"2107\"\u003e Classic hand-wound and automatic models (depending on the model)\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp data-end=\"2283\" data-start=\"2170\"\u003e⚠️ \u003cstrong data-end=\"2185\" data-start=\"2173\"\u003eNote:\u003c\/strong\u003e The exact model assignment depends on the specific housing. A dimensional check is recommended before installation.\u003c\/p\u003e","brand":"Vintage \u0026 JDM (Japan Domestic Market)","offers":[{"title":"Default Title","offer_id":52265328312658,"sku":null,"price":10.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/FullSizeRender_f7ae29a7-39a7-4671-8b93-8ee071dfe606.heic?v=1765646629","url":"https:\/\/japanese-microbrands.com\/en\/products\/seiko-original-dichtung-gasket-1-stuck-ref-oh2300b01-736-nos","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}