The Seiko 7N42-6B20 is a watch model based on the 7N42 movement.
Parts List
| 290P03HN03 | crystal - crystal |
| 8K40A0SNG2 | crown - crown |
| 8K40A0SNW1 | crown - crown |
| FH3180B01 | case back gasket - case back gasket |
| 86565320 | crystal gasket - plastic gasket for crystal |
| 4EP4LW | band - leather band |
| 4ES9JW | band - leather band |
| 4274JB | band - metallband |
| 4EP4LW-LB | band - leather without buckle |
| 4274JB-LKS | band - link |
| 4ES9JW-LB | band - leather without buckle |
| 4274JB-BK2S | clasp - buckle |
| 4274JB-PB1 | clasp - parts for buckle |
| 3AX120F0ASR | others - hand |
| 3AX120F0ASF | others - second hand |
| 1AB080AEBSS | others - hour hand |
| 2AB115AFBSS | others - minute hand |
| 1AB080AEBSG | others - hour hand |
| 2AB115AFBSG | others - minute hand |
| 0351892 | others - winding stem |
| 82832120 | others - case ring |
| 7N426B2061Y | others - case |
| 82363749 | others - decorative bezel |
| 7N426B20 | others - case back |
| 7N426B2098Z | others - case |
| 82363741 | others - decorative bezel |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 7N426B2061Z | others - case |
| 4EP4LW-EP7 | others - endpiece |
| 4ES9JW-EP7 | others - endpiece |
| 7N423 | others - machine code |
| 7N426B88XS13 | others - dial |
| 7N426C08XL13 | others - dial |
| 7N426C08XS14 | others - dial |
| 84325123 | others - dial ring |
| 84325124 | others - dial ring |
| A180BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |