{"product_id":"seiko-ersatzteil-aufzugswelle-巻芯-winding-stem-fur-seiko-kaliber-4n21-1-stuck-nos","title":"Seiko Spare Part - Winding Stem for Seiko Caliber 4N21 (1 Piece) - NOS","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eOriginal \u003cstrong\u003eSeiko Winding Stem (巻芯)\u003c\/strong\u003e from new old stock (NOS) for the \u003cstrong\u003eSeiko Caliber 4N21\u003c\/strong\u003e. Offered is \u003cstrong\u003ea single piece\u003c\/strong\u003e, in the original SEIKO bag (handwritten \"4N21 \/ 巻芯\").\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe winding stem is necessary for winding and hand setting: The square engages with the setting mechanism, the external thread accommodates the crown.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRegarding caliber assignment: The 4N21 caliber belongs to the Seiko \"4N\" family of small movements; the corresponding Seiko winding stem is listed in parts catalogs as reference 351155 (common for 4N00\/4N01\/4N20\/4N21\/4N70\/4N71).\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe part is unused; due to storage, minor, purely cosmetic traces are possible, but these do not affect the function.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNote on assignment: Before installation, please compare dimensions, thread, length, and square with the required winding stem or your own movement.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eManufacturer: Seiko (K. Hattori \u0026amp; Co., Japan).\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-pre-wrap leading-[1.7]\"\u003eWarranty (used) This is an original part (NOS) stored for decades. The limitation period for defect claims (statutory warranty) is 12 months from delivery.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-pre-wrap leading-[1.7]\"\u003eNote Before installation, please compare dimensions and fit with the required winding stem; installation should be carried out professionally.\u003c\/p\u003e","brand":"Vintage \u0026 JDM (Japan Domestic Market)","offers":[{"title":"Default Title","offer_id":53675733778770,"sku":null,"price":8.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/208F3062-9DC7-40AB-ADFD-10263B6E1225.jpg?v=1780854051","url":"https:\/\/japanese-microbrands.com\/en\/products\/seiko-ersatzteil-aufzugswelle-%e5%b7%bb%e8%8a%af-winding-stem-fur-seiko-kaliber-4n21-1-stuck-nos","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}