The Seiko 2C20-5640 is a watch model based on the 2C20 movement.
Parts List
| REAN31JN00 | crystal |
| 30N77NA1 | crown |
| DZ0065B01 | case back gasket - button gasket |
| 0H2100B01 | case back gasket |
| B5192C | band - metal band |
| B5192C-LKG | band - link |
| B5192D | band - metal band |
| B5192D-LKG | band - link |
| B5192G | band - metal band |
| B5192G-LKG | band - link |
| B5192G-PB1 | clasp - parts for buckle/clasp |
| B5192G-BK4G | clasp - clasp |
| B5192D-PB1 | clasp - parts for buckle/clasp |
| B5192D-BK4G | clasp - clasp |
| B5192C-PB1 | clasp - parts for buckle/clasp |
| B5192C-BK4S | clasp - clasp |
| 07V05DGM | others - minute hand |
| 2C2010 | others - machine code |
| 2C201330XB14 | others - dial |
| 2C201330XG14 | others - dial |
| 2C201330XN14 | others - dial |
| 2C20564025 | others - case |
| 2C205640EA | others - case |
| 2C205640JJ | others - case |
| 82713330 | others - case ring |
| B5192C-EP2 | others - endpiece |
| B5192D-EP2 | others - endpiece |
| B5192G-EP2 | others - endpiece |
| 08L01DGH | others - hour hand |
| 1CE050LABDG | others - hour hand |
Caliber 2C20
