The Seiko 1F21-0AT0 is a watch model based on the 1F21 movement.
Parts List
| 160A06SB0A | crystal - crystal (sapphire) |
| 6K40Z0SNWB | crown - crown (3h) |
| 6K40Z0SNWA | crown - crown (3h) |
| 0F150BAD2 | case back gasket - case back gasket |
| D304AG | band - band |
| DFN4AW | band - band |
| D304CG | band - band |
| D304AG-LK00 | band - link |
| D304CG-LK00 | band - link |
| DFN4AW-BK00 | clasp - clasp |
| D304CG-BK00 | clasp - clasp |
| D304AG-BK00 | clasp - clasp |
| 07SC06DP | others - second hand |
| 1BH032A1BNS | others - hour hand |
| 2BH045A1BNS | others - minute hand |
| 1F210AT001A | others - case |
| 0351807 | others - winding stem |
| AC004BAD1 | others - crown and stem gasket |
| 07SC06DS | others - second hand |
| 1F210AT002A | others - case |
| 82813760 | others - case ring |
| 1F210AT0 | others - case back |
| 1F210BE0XS15 | others - dial |
| 1F210BE0XS25 | others - dial |
| 1F210BE0XS35 | others - dial |
| 1F213 | others - machine code |
| D304AG-BKPP | others - spring bar for buckle/clasp |
| D304CG-BKPP | others - spring bar for buckle/clasp |
| D304AG-LKPC | others - pipe for link |
| D304AG-LKPN | others - pin for link |
| T090BS | others - push pin |
| D304CG-LKPC | others - pipe for link |
| D304CG-LKPN | others - pin for link |