The Seiko V657-0B20 is a watch model based on the V657 movement.
Parts List
| 290P03LN03 | crystal - crystal |
| 8K50G0SNW1 | crown - crown |
| FE308BA13 | case back gasket - case back gasket |
| FH3080B01 | case back gasket - case back gasket |
| 86565320 | crystal gasket - plastic gasket for crystal |
| A30A04SMS0A | pusher - button |
| 3086AB | band - band |
| 3086JB | band - band |
| 1AB080L0BSB | others - hour hand |
| 2AB120L0BSB | others - minute hand |
| 3BA040F4BNB | others - sub hand |
| 3BA040F4BAK | others - small hand (6h) |
| 3AX120F0ASF | others - second hand |
| 3AX120F0ASB | others - second hand |
| 3BA040F4BAY | others - sub hand |
| 2AB120L0BSW | others - minute hand |
| 1AB080L0BSW | others - hour hand |
| 0351892 | others - winding stem |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
| V6570B2001 | others - case |
| V6570B20 | others - case back |
| V6570B2001A | others - case |
| 0878220 | others - date dial |
| S180BS | others - push pin |
| V6570B30XB13 | others - dial |
| V6570B30XE13 | others - dial |
| V6570B30XL13 | others - dial |
| V6570B38XB13 | others - dial |
| V6570B38XE13 | others - dial |
| V6570B38XL13 | others - dial |
| V6570B38XS13 | others - dial |
| V65720 | others - machine code |