The Seiko 1F21-0BH0 is a watch model based on the 1F21 movement.
Parts List
| RE8A06SB0B | crystal - crystal (sapphire) |
| RE8A06SB0K | crystal - crystal (sapphire) |
| 6K40C6STGA | crown - crown (3h) |
| 6K40C6STWA | crown - crown (3h) |
| 0F180BAD2 | case back gasket - case back gasket |
| DA2C1JM | band - metal band |
| DA2C1JMLK | band - link |
| DA2C1KM | band - metal band |
| DA2C1KMLK | band - link |
| N0HP22SA00B | clasp - clasp |
| N0HP22SE00B | clasp - clasp |
| 2BA067L0BD2 | hand - minute hand |
| 2BA067L0BDN | hand - minute hand |
| 1BA045L2BD2 | hand - hour hand |
| 1BA045L2BDN | hand - hour hand |
| 3BA095FABAB | others - second hand |
| 3BA095FABNG | others - second hand |
| 81181459 | others - bracelet fixing pipe |
| 81190075 | others - bracelet fixing pipe |
| 81607079 | others - bracelet fixing pin |
| 81620299 | others - bracelet fixing pin |
| 0351807 | others - winding stem |
| AC004BAD1 | others - crown and stem gasket |
| 1F210BH0 | others - case back |
| 1F210BH001A | others - case |
| 1F210BH002A | others - case |
| 1F210CJ0XS15 | others - dial |
| 1F210CJ0XY15 | others - dial |
| 1F213 | others - machine code |
| 82845980 | others - case ring |