Seiko 8420-5A20 Watch Guide The Seiko 8420-5A20 is a watch model based on the 8420 movement.Parts ListWI081others - other bandCaliber 8420Other models with the same movement8420-00198420-00408420-004A8420-004B8420-004C8420-004E8420-004F8420-00598420-00708420-00808420-00908420-01008420-01108420-01208420-01398420-01408420-01508420-01798420-02098420-02498420-02608420-02708420-02808420-02908420-50108420-50208420-50308420-50408420-50508420-50608420-50708420-50898420-50998420-51068420-51078420-51088420-51098420-51198420-51298420-51398420-51408420-51508420-51608420-51708420-51908420-52098420-52178420-52198420-52298420-52398420-53108420-53208420-53498420-53608420-53708420-53808420-53908420-54008420-54108420-54208420-54308420-54408420-54508420-54608420-54898420-54998420-55198420-55298420-55408420-55508420-55608420-55808420-55908420-56008420-56308420-56408420-56508420-56608420-57108420-57208420-57308420-57408420-57508420-57698420-57808420-58098420-58198420-58298420-58398420-58498420-58508420-58698420-58798420-58808420-58898420-58998420-59098420-59108420-59198420-59298420-59398420-59408420-59508420-59708420-59898420-5A008420-5A508420-60008420-60508420-60608420-60708420-60808420-60908420-61108420-61208420-61308420-61408420-61508420-61608420-61798420-61858420-61898420-61998420-62098420-62198420-62298420-62398420-62498420-62598420-62808420-628A8420-63008420-63208420-63308420-63408420-63508420-63608420-63708420-63808420-63908420-64008420-64108420-64298420-64398420-64408420-64508420-64698420-64798420-64898420-64998420-65098420-65208420-65308420-65408420-65598420-65798420-66008420-66108420-66208420-66308420-66408420-66508420-66608420-66708420-67098420-67108420-67208420-67308420-67408420-67508420-67698420-676H8420-67708420-67808420-67998420-68198420-68398420-68498420-68598420-68698420-68798420-68898420-68998420-69098420-69198420-69208420-69298420-69398420-69498420-69598420-69698420-69798420-69808420-69908420-70008420-70208420-70398420-703H8420-70498420-70598420-70698420-70908420-709A8420-71008420-710A8420-71298420-72198420-72508420-725A8420-72698420-72798420-72898420-72998420-73098420-73198420-73298420-73398420-73498420-73598420-73698420-73798420-73898420-738H8420-73998420-74098420-74198420-74298420-742H8420-74398420-74498420-74598420-74698420-76398420-76498420-76508420-76608420-76908420-77008420-77108420-77208420-77308420-77408420-77508420-77608420-77708420-77808420-78008420-78108420-78208420-78308420-7840