The Seiko V657-0C20 is a watch model based on the V657 movement.
Parts List
| 300P03HN02 | crystal - crystal (inorganic) |
| 8K50E6SNW1 | crown - crown |
| FE308BAD2 | case back gasket - case back gasket |
| 86178610 | crystal gasket - plastic gasket for crystal |
| 86583220 | bezel gasket - plastic gasket for bezel |
| A35A05SMS0A | pusher - button |
| 49X5JM | band - band |
| 49X5JM-LK5 | band - link |
| 49X5JM-PB1 | clasp - parts for buckle |
| 49X5JM-BKD | clasp - buckle |
| 1AA085L0BSS | others - hour hand |
| 3BA030F0BNS | others - small hand (9h) |
| 2AA120L0BSS | others - minute hand |
| 3AA125F1ANS | others - second hand |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
| 0351892 | others - winding stem |
| 81181879 | others - bracelet fixing pipe |
| 81612549 | others - bracelet fixing pin |
| 82347589 | others - bezel |
| V6570C2002D | others - case |
| V6570C20 | others - case back |
| 0878221 | others - date dial |
| 84331805 | others - dial ring |
| V6570C68XB33 | others - dial |
| V65720 | others - machine code |