The Seiko 1F21-0BB0 is a watch model based on the 1F21 movement.
Parts List
| RE8A06SB0C | crystal - crystal (sapphire) |
| RE8A06SB0F | crystal - crystal (sapphire) |
| RE8A06SB0H | crystal - crystal (sapphire) |
| 6K40C6STGA | crown - crown (3h) |
| 6K40C6STWA | crown - crown (3h) |
| 0F180BAD2 | case back gasket - case back gasket |
| D3F5AB | band - metal band |
| D3F5AB-LK00 | band - link |
| D3F5AB-LKPM | band - other band parts |
| D3F6EB | band - metal band |
| D3F6EB-LK00 | band - link |
| DA242MM | band - metal band |
| DA242MMLK | band - link |
| N0HP22SF00B | clasp - clasp |
| D3F6EB-BK00 | clasp - clasp |
| D3F5AB-BK00 | clasp - clasp |
| 2BA067L0BD1 | hand - minute hand |
| 2BA067L0BD2 | hand - minute hand |
| 1BA045L2BD1 | hand - hour hand |
| 1BA045L2BD2 | hand - hour hand |
| 3BA095FABNS | others - second hand |
| 3BA095FABNG | others - second hand |
| 81181459 | others - bracelet fixing pipe |
| 81190055 | others - bracelet fixing pipe |
| 81607079 | others - bracelet fixing pin |
| 81620299 | others - bracelet fixing pin |
| AC004BAD1 | others - crown and stem gasket |
| 1F210BB0 | others - case back |
| 1F210BB001A | others - case |
| 1F210BB002A | others - case |
| 1F210BB003A | others - case |
| 1F210BB004A | others - case |
| 1F210BP0XB15 | others - dial |
| 1F210BP0XG15 | others - dial |
| 1F210BR0X915 | others - dial |
| 1F210BT0XA15 | others - dial |
| 1F213 | others - machine code |
| D3F5AB-BKPN | others - pin for buckle/clasp |
| 82845980 | others - case ring |
| D3F5AB-LKPN | others - pin for link |
| 0351807 | others - winding stem |