The Seiko 2P21-0B40 is a watch model based on the 2P21 movement.
Parts List
| 200W14SN01 | crystal - crystal |
| 35MC2NA1 | crown - crown |
| 0A2000N0A | case back gasket |
| 86179091 | crystal gasket |
| DB26A | band - metal band |
| DB27A | band - metal band |
| 08SC14NG | others - second hand |
| 0351236 | others - winding stem |
| 2P210B40 | others - case back |
| 2P210B4075 | others - case |
| 2P210B40P7 | others - case |
| 2P210F80XG19 | others - dial |
| 2P210F80XS19 | others - dial |
| 2P210F90XS19 | others - dial |
| 2P219 | others - machine code |
| 82804800 | others - case ring |
| B080BS | others - push pin |
| EA0040B0A | others - crown and stem gasket |
| 08TA0A1H | others - hour hand |
| 08TA0A1M | others - minute hand |
| 08TD4FGH | others - hour hand |
Caliber 2P21
