The Seiko 1F21-5F40 is a watch model based on the 1F21 movement.
Parts List
| RE5A67SN02 | crystal - crystal |
| 6M30E3SNG0 | crown - crown |
| 0F170BA1S | case back gasket - case back gasket |
| D1R5BB-LK00 | band - link |
| D1R5BB | band - band |
| D1R5BB-BK00 | clasp - clasp |
| 3BA050F1BNG | others - second hand |
| 1BH030A1BNG | others - hour hand |
| 2BH045A1BNG | others - minute hand |
| 81190055 | others - bracelet fixing pipe |
| 81606459 | others - bracelet fixing pin |
| 82840240 | others - case ring |
| 1F215F4001A | others - case |
| 1F215F40 | others - case back |
| 1F212D30XG14 | others - dial |
| 1F212D40XA14 | others - dial |
| 1F215 | others - machine code |
| 0351807 | others - winding stem |
| DB004BAD1 | others - crown and stem gasket |