The Seiko 2P21-5240 is a watch model based on the 2P21 movement.
Parts List
| ESDW05JM01 | crystal |
| ESDW05JM | crystal |
| 32M29NA1 | crown |
| AC004BA1 | case back gasket |
| 0F150BAA5 | case back gasket - case back gasket |
| 0F150BAA | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| Z5265C | band - metal band |
| Z5265C-LKG | band - link |
| Z5265D | band - metal band |
| Z5265D-LKG | band - link |
| Z5265G | band - metal band |
| Z5265G-LKG | band - link |
| Z5265G-PB1 | clasp - parts for buckle/clasp |
| Z5265G-BK4G | clasp - clasp |
| Z5265D-PB1 | clasp - parts for buckle/clasp |
| Z5265D-BK4G | clasp - clasp |
| Z5265C-PB1 | clasp - parts for buckle/clasp |
| Z5265C-BK4S | clasp - clasp |
| 06SC15NG | others - second hand |
| 3BA075F1BNG | others - second hand |
| 1BH040A1BAA | others - hour hand |
| 06T03DGM | others - minute hand |
| 05T27AGM | others - minute hand |
| 06SC11NG | others - second hand |
| 1BA040A1BNG | others - hour hand |
| 81180249 | others - bracelet fixing pipe |
| 81611299 | others - bracelet fixing pin |
| 2P210720X999 | others - dial |
| 2P210730XB14 | others - dial |
| 2P210730XG14 | others - dial |
| 2P215240 | others - case back |
| 2P21524075 | others - case |
| 2P21524079 | others - case |
| 2P215240WE | others - case |
| 2P219 | others - machine code |
| 82821270 | others - case ring |
| 2BA060A1BNG | others - minute hand |
| 2BH057A1BAA | others - minute hand |
| 2BA060A1BDG | others - minute hand |
Caliber 2P21
