The Seiko 1F21-0AD0 is a watch model based on the 1F21 movement.
Parts List
| 165A03SN02 | crystal - crystal |
| 6K35B3SNS0 | crown - crown |
| 0F160BAD2 | case back gasket - case back gasket |
| D1T6AB-LK00 | band - link |
| D1T6AB | band - band |
| D1T6AB-BK00 | clasp - clasp |
| D1T6AB-BKLK-6H | clasp - parts for buckle/clasp |
| 3BA075F1BNS | others - second hand |
| 1BG040L2BDS | others - hour hand |
| 2BG057LABDS | others - minute hand |
| AC004BAD1 | others - crown and stem gasket |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82841800 | others - case ring |
| 1F210AD001A | others - case |
| 1F210AD0 | others - case back |
| 1F210AG0XL15 | others - dial |
| 1F215 | others - machine code |
| 0351807 | others - winding stem |
| D1T6AB-BKPP | others - spring bar for buckle/clasp |
| D1T6AB-LK01 | others - half adjust link |
| D1T6AB-LKPN | others - pin for link |