The Seiko 5M42-0B20 is a watch model based on the 5M42 movement.
Parts List
| 290P03HN03 | crystal - crystal |
| 200P14JN | crystal |
| 200P14JNL3 | crystal - crystal(case back) |
| 45MB8NA1 | crown - crown |
| 45MB8NS1 | crown - crown stahl |
| EC0060B0 | case back gasket - crown gasket |
| FH2980B0A | case back gasket - case back gasket |
| 86581741 | crystal gasket - plastic gasket for crystal |
| 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) |
| 43A3KZ-LKG | band - link |
| 43A3LZ-LKG | band - link |
| 43A3LZ | band - band |
| 43A3KZ | band - band |
| 43A3JZ | band - band |
| 43A3LZ-BK1S | clasp - buckle |
| 43A3LZ-PB1 | clasp - parts for buckle |
| 43A3KZ-BK1G | clasp - buckle |
| 43A3KZ-PB1 | clasp - parts for buckle |
| 5M420B2098Z | others - case |
| 0866636 | others - holding ring for dial |
| 0878729 | others - date dial |
| 0878730 | others - date dial |
| 0878732 | others - date dial |
| 5M420B2075Z | others - case |
| 82289521 | others - bezel |
| 5M420B2061Z | others - case |
| 82289529 | others - bezel |
| 5M420B20 | others - case back |
| 5M420B206YZ | others - case |
| 82289524 | others - bezel |
| 0351651 | others - winding stem |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| 5M420B78XL13 | others - dial |
| 5M420B78XL24 | others - dial |
| 5M420B78XS14 | others - dial |
| 5M425 | others - machine code |
| A180BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |
| 81400829 | others - button spring clip |
| 3AX125F3ASG | others - second hand |
| 3AX125F3ASS | others - second hand |
| 2AB120L4BSG | others - minute hand |
| 2AB120L4BSS | others - minute hand |
| 1AB080L2BSG | others - hour hand |
| 1AB080L2BSS | others - hour hand |
Caliber 5M42
