{"product_id":"seiko-s-283-kojiake-gehauseoffner-fur-sprungboden-mittlere-klinge-5-mm-original-seiko-japan","title":"SEIKO S-283 Kojiake – Case Opener for Snap-On Case Backs, Medium Blade 5 mm | Original SEIKO Japan","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOriginal SEIKO watchmaker's tool, imported directly from Japan – hardly available outside of Japan (except in our shop).\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe Kojiake (こじ開け, \"case opener\") is the classic Japanese tool for opening snap-on and press-fit casebacks. The S-283 version from the professional SEIKO tool range features the mid-sized blade of the series with a 5 mm tip width – the all-rounder for smaller cases with narrow opening notches. It bridges the gap between the wide 8 mm blade for large men's watches and the extra-narrow 4 mm blade for the smallest ladies' cases, making it the most common size for classic vintage men's watches from the 1960s and 1970s – such as many SEIKO and Citizen models with snap-on casebacks.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA special feature of the SEIKO Kojiake: the blade is deliberately designed so that it can be re-sharpened by the watchmaker and adapted to the respective case – as is common in Japanese workshops. The tool thus grows with its tasks and, with good care, lasts a watchmaker's lifetime.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe series includes three blade widths: S-282 (8 mm), S-283 (5 mm, this offer), and S-284 (4 mm).\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat distinguishes this tool from its European counterparts:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEuropean case knives are predominantly designed as wide universal blades and do not cover the fine gradations of narrow opening notches. The SEIKO Kojiake, with its precisely dimensioned blade width, fits snugly into the notch – the design used to open snap-on casebacks of Japanese watches (SEIKO, Citizen, Orient) from the factory. A suitable blade width determines whether the caseback springs open in a controlled manner or whether the tool slips and leaves scratches. In addition, there is the re-sharpenable blade: cheap openers with soft blades bend at the tip and have to be replaced; the SEIKO Kojiake, on the other hand, is re-sharpened. The original SEIKO tool program is not regularly distributed in Europe.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e\u003cbr\u003eTip width 5 mm\u003cbr\u003eReference: SEIKO S-283 (SE-S-283)\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cbr\u003eNew, original packaging\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eNote\u003cbr\u003eImproper use of tools can damage watches. Use is at your own risk.\u003c\/p\u003e","brand":"Vintage \u0026 JDM (Japan Domestic Market)","offers":[{"title":"Default Title","offer_id":53925233590610,"sku":null,"price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/rn-image_picker_lib_temp_2f7f2ab5-689c-46c4-9e21-5a468803b55c.jpg?v=1783414064","url":"https:\/\/japanese-microbrands.com\/en\/products\/seiko-s-283-kojiake-gehauseoffner-fur-sprungboden-mittlere-klinge-5-mm-original-seiko-japan","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}