The Seiko 5M42-0G20 is a watch model based on the 5M42 movement.
Parts List
| 300P03TN03 | crystal |
| 300P03TNC3 | crystal - crystal |
| 8K60A0SNW1 | crown - crown |
| FH2980B0A | case back gasket - case back gasket |
| 86178610 | crystal gasket - plastic gasket for crystal |
| 86179271 | bezel gasket - plastic gasket for bezel |
| 80608709 | pusher - button |
| D148AG | band - band |
| DE03AW | band - leather band |
| D148AG-LK9 | band - link |
| DE04AW | band - leather band |
| D148AG-BKX | clasp - clasp |
| D148AG-PB1 | clasp - parts for buckle/clasp |
| 1AB080F0BEB | others - hour hand |
| 1AB080F0BEW | others - hour hand |
| 2BB120F0BEB | others - minute hand |
| 2BB120F0BEW | others - minute hand |
| 3AX125FNAAW | others - second hand |
| 3AX125FNAAB | others - second hand |
| 0351651 | others - winding stem |
| 81400709 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BA11 | others - crown and stem gasket |
| 5M420G2061 | others - case |
| 82294729 | others - bezel |
| 5M420G20 | others - case back |
| D148AG-EP2 | others - endpiece |
| D148AG-LKPN | others - pin for link |
| 5M420G2061A | others - case |
| 0866636 | others - holding ring for dial |
| 0878876 | others - date dial |
| 0878877 | others - date dial |
| 5M420K00XB13 | others - dial |
| 5M420K10XS1Z | others - dial |
| 5M425 | others - machine code |
| 84326125 | others - dial ring |
| 84326126 | others - dial ring |
| A180BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 5M42
