The Seiko 1F21-0BN0 is a watch model based on the 1F21 movement.
Parts List
| 200A31SN02 | crystal - crystal (sapphire) |
| 6M30E3SNS0 | crown - crown (3h) |
| 6M30E3SNG3 | crown - crown |
| 0F170BA1S | case back gasket - case back gasket |
| DAT9BW | band - band |
| L022011J9 | band - leather band |
| AD06JSA00B | clasp - buckle |
| 1BA055A1BAM | others - hour hand |
| 2BA082A1BAM | others - minute hand |
| 3BA090F1BA6 | others - second hand |
| A120BS | others - push pin (for lb) |
| 1F210070XS14 | others - dial |
| 1F210070XS24 | others - dial |
| 1F210BN0 | others - case back |
| 1F210BN001A | others - case |
| 1F210BN002A | others - case |
| 1F215 | others - machine code |
| DB004BAD1 | others - crown and stem gasket |
| 82870230 | others - case ring |
| 0351807 | others - winding stem |