The Seiko 5M42-0B50 is a watch model based on the 5M42 movement.
Parts List
| 290P03HN03 | crystal - crystal |
| 40M78NS1 | crown - crown |
| 40M78NA1 | crown - crown |
| EC0060B0 | case back gasket - crown gasket |
| FH2980B0A | case back gasket - case back gasket |
| 86565320 | crystal gasket - plastic gasket for crystal |
| 86179411 | bezel gasket - plastic gasket for bezel |
| 80600541 | pusher - button |
| EC0060B01 | pusher - pusher gasket |
| 80600549 | pusher - button (2h) |
| 4269JG | band - metal band |
| LOCAL | band - band |
| 4269KG-LKG | band - link |
| 4269LG-LKG | band - link |
| 4269KG | band - band |
| 4269LG | band - metal band |
| 4269LG-BK2S | clasp - buckle |
| 4269LG-PB1 | clasp - parts for buckle |
| 4269KG-BK2G | clasp - buckle |
| 4269KG-PB1 | clasp - parts for buckle |
| 3AA125F0ANG | others - second hand |
| 3AX130F0ASS | others - second hand |
| 0351651 | others - winding stem |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| 0866636 | others - holding ring for dial |
| 0878729 | others - date dial |
| 0878732 | others - date dial |
| 5M420B5061Z | others - case |
| 82289569 | others - bezel |
| 5M420B50 | others - case back |
| 5M420B5075Z | others - case |
| 82289561 | others - bezel |
| 5M420B5098Z | others - case |
| 5M420C58XS13 | others - dial |
| 5M420C68XL14 | others - dial |
| 5M420C68XN14 | others - dial |
| 5M420C68XS14 | others - dial |
| 5M420C78XS14 | others - dial |
| 5M425 | others - machine code |
| A190BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |
| 81400829 | others - button spring clip |
| 2AB115A8BSS | others - minute hand |
| 2AB120L6BCC | others - minute hand |
| 2AD115A2BAA | others - minute hand |
| 2AB120L6BCL | others - minute hand |
| 1AB075A4BSS | others - hour hand |
| 1AB075L6BCC | others - hour hand |
| 1AC080A1BAA | others - hour hand |
| 1AB075L6BCL | others - hour hand |
Caliber 5M42
