The Seiko YT57-0B20 is a watch model based on the YT57 movement.
Parts List
| 290P03LN03 | crystal - crystal |
| 8K50B2SNW1 | crown - crown |
| FH2980B01 | case back gasket - case back gasket |
| 86581741 | crystal gasket - plastic gasket for crystal |
| 86565320 | crystal gasket - plastic gasket for crystal |
| 86178450 | bezel gasket - plastic gasket for bezel |
| F1G5JB | band - band |
| FET8JZ | band - band |
| FF50JZ | band - band |
| FF49JZ | band - band |
| 1AX080FCBFB | others - hour hand |
| 1AX080FCBES | others - hour hand |
| 3AX135F0AF3 | others - second hand |
| 2AX120FMBFB | others - minute hand |
| 2AX120FMBES | others - minute hand |
| 3AX135F0AES | others - second hand |
| 3AX125F8AE1 | others - second hand |
| 1AX080FCBEB | others - hour hand |
| 2AX120FMBEB | others - minute hand |
| 0351653 | others - winding stem |
| 200P02HN03 | others - crystal(case back) |
| S200BS | others - push pin |
| YT570B2001Z | others - case |
| 82356849 | others - bezel |
| 0Z0060B01 | others - crown and stem gasket |