The Seiko 2P20-5100 is a watch model based on the 2P20 movement.
Parts List
| REEN01JN01 | crystal |
| 30NA9NA1 | crown |
| 0F170NA11 | case back gasket |
| B5327G | band - metal band |
| B5327G-LKG | band - link |
| B5327G-PB1 | clasp - parts for buckle/clasp |
| B5327G-BK4G | clasp - clasp |
| B5327G-EP2 | others - endpiece |
| DA007BA11 | others - crown and stem gasket |
| 05Y01DGH | others - hour hand |
| 2P200180XG14 | others - dial |
| 2P20510025 | others - case |
| 82731430 | others - case ring |
| 05Y01DGM | others - minute hand |
Caliber 2P20
