The Seiko 2P21-0A79 is a watch model based on the 2P21 movement.
Parts List
| 140W04HM | crystal |
| 140W04HM01 | crystal |
| 140W04HM02 | crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NS1 | crown - crown |
| 0A1400N01 | case back gasket |
| EZ0035B0 | case back gasket |
| B5388G | band - metal band |
| B5388S | band - metal band |
| B5388S-BK3S | clasp - clasp |
| B5388G-BK3G | clasp - clasp |
| 05T02NSM | hand - minute hand |
| 05T06NSH | hand - hour hand |
| 07SC02NG | others - second hand |
| 07SC02NS | others - second hand |
| 0351236 | others - winding stem |
| 05T02NGM | others - minute hand |
| 2P210A79 | others - case back |
| 2P210A7975 | others - case |
| 2P210A797E | others - case |
| 2P210D30XG14 | others - dial |
| 2P210D30XS13 | others - dial |
| 2P219 | others - machine code |
| T070AS | others - push pin |
| 82801060 | others - case ring |
| EZ0035B01 | others - crown and stem gasket |
| 05T06NGH | others - hour hand |
Caliber 2P21
