The Seiko 5M42-0L20 is a watch model based on the 5M42 movement.
Parts List
| 300P04HN03 | crystal |
| 8K50E6SNW1 | crown - crown |
| 8K50E6SNG1 | crown - crown |
| FE298BAD2 | case back gasket - case back gasket |
| 86178611 | crystal gasket - plastic gasket for crystal |
| 86178610 | crystal gasket - plastic gasket for crystal |
| 86179271 | bezel gasket - plastic gasket for bezel |
| A35A06SMG0A | pusher - button |
| A35A06SMS0A | pusher - button |
| 48T1JZ | band - band |
| 48T1KZ | band - band |
| 48T1LZ | band - band |
| 48T1JZ-LK2 | band - link |
| 48T1KZ-LK4 | band - link |
| 48T1LZ-LK4 | band - link |
| 48T1KZ-PB1 | clasp - parts for buckle |
| 48T1JZ-BKD | clasp - buckle |
| 48T1KZ-BKG | clasp - buckle |
| 48T1LZ-BKD | clasp - buckle |
| 48T1LZ-PB1 | clasp - parts for buckle |
| 48T1JZ-PB1 | clasp - parts for buckle |
| 3AX130F0ASS | others - second hand |
| 3AX130F0ASG | others - second hand |
| 1AA080L2BSG | others - hour hand |
| 1AA080L2BSS | others - hour hand |
| 2AA120L0BSG | others - minute hand |
| 2AA120L0BSS | others - minute hand |
| 81601169 | others - bracelet fixing pin |
| 81180189 | others - bracelet fixing pipe |
| 5M420L2061Y | others - case |
| 82297069 | others - bezel |
| 5M420L20 | others - case back |
| 0351651 | others - winding stem |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
| 5M420L2061Z | others - case |
| 5M420L206YY | others - case |
| 82297061 | others - bezel |
| 5M420L206YZ | others - case |
| 5M420L2075Z | others - case |
| 0866636 | others - holding ring for dial |
| 0878729 | others - date dial |
| 0878730 | others - date dial |
| 0878732 | others - date dial |
| 5M420N98XB13 | others - dial |
| 5M420N98XL14 | others - dial |
| 5M420N98XS14 | others - dial |
| 5M420N98XS23 | others - dial |
| 5M420R48XL14 | others - dial |
| 5M420R48XS13 | others - dial |
| 5M420R48XS24 | others - dial |
| 5M425 | others - machine code |
| 84329404 | others - dial ring |
| 84329405 | others - dial ring |
| 84329406 | others - dial ring |
Caliber 5M42
