The Seiko 2P21-5A80 is a watch model based on the 2P21 movement.
Parts List
| ES9W16HM01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86574740 | crystal gasket - plastic gasket for crystal |
| 86574741 | crystal gasket - plastic gasket for crystal |
| B5379C | band - metal band |
| B5379C-LKG | band - link |
| B5379D | band - metal band |
| B5379D-LKG | band - link |
| B5379D-BK4G | clasp - clasp |
| B5379C-BK4G | clasp - clasp |
| 06T30ZGH | hand - hour hand |
| 06T30ZGM | hand - minute hand |
| 07SC02NG | others - second hand |
| 0351236 | others - winding stem |
| EZ0035B0A | others - crown and stem gasket |
| 2P210B40XN14 | others - dial |
| 2P210B50XN14 | others - dial |
| 2P215A80SA | others - case |
| 2P215A80WE | others - case |
| 2P219 | others - machine code |
| 82801040 | others - case ring |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| EZ0035B01 | others - crown and stem gasket |
| 06T22NGH | others - hour hand |
| 06T22NGM | others - minute hand |
Caliber 2P21
