The Seiko 7N42-6C20 is a watch model based on the 7N42 movement.
Parts List
| 320P02SN03 | crystal - crystal |
| 8K65A4SNW1 | crown - crown |
| FE298BAD2 | case back gasket - case back gasket |
| 86566880 | crystal gasket - plastic gasket for crystal |
| 86583460 | bezel gasket - plastic gasket for bezel |
| 4J35JW | band - band |
| 30R8JB | band - band |
| 30R8JB-LK3 | band - link |
| 30R8JB-BKJ | clasp - buckle |
| 30R8JB-PB6 | clasp - parts for buckle |
| 3AX130F8ASX | others - second hand |
| 1AX080S2BTS | others - hour hand |
| 2BA115S2BTS | others - minute hand |
| 0351892 | others - winding stem |
| 82830140 | others - case ring |
| 82345929 | others - bezel |
| 0878580 | others - date dial |
| 7N426C2001D | others - case |
| 7N426C20 | others - case back |
| 7N426C2002D | others - case |
| 7N423 | others - machine code |
| 7N426C88XL13 | others - dial |
| 84331624 | others - dial ring |
| S200BS | others - push pin |
| AD006BAD1 | others - crown and stem gasket |