The Seiko 7N42-8A90 is a watch model based on the 7N42 movement.
Parts List
| 290P02SN02 | crystal - crystal (sapphire) |
| 8K45B5SNG0 | crown - crown |
| 8K45B5TNA0 | crown - crown |
| FE308BAD2 | case back gasket - case back gasket |
| 86565320 | crystal gasket - plastic gasket for crystal |
| 30R1MG-LK3 | band - link |
| 30R1NG-LK5 | band - link |
| 30R1MG | band - band |
| 30R1NG | band - band |
| 30R1MG-BKF | clasp - buckle |
| 30R1NG-BKF | clasp - buckle |
| 30R1MG-PB4 | clasp - parts for buckle |
| 30R1NG-PB4 | clasp - parts for buckle |
| 1AA085L0BTC | others - hour hand |
| 1AA085L0BTG | others - hour hand |
| 1AA085L0BTS | others - hour hand |
| 2AA120L0BTC | others - minute hand |
| 2AA120L0BTG | others - minute hand |
| 2AA120L0BTS | others - minute hand |
| 0351892 | others - winding stem |
| 82737920 | others - case ring |
| 7N428A9001 | others - case |
| 7N428A90 | others - case back |
| 7N428A9003B | others - case |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 0878589 | others - date dial |
| 7N428A9002 | others - case |
| AD006BAD1 | others - crown and stem gasket |
| 7N423 | others - machine code |
| 7N428B98XL13 | others - dial |
| 7N428B98XL24 | others - dial |
| 7N428B98XN13 | others - dial |
| 7N428B98XN24 | others - dial |
| S200BS | others - push pin |
| 3AX125F3ASG | others - second hand |
| 3AX125F3ASS | others - second hand |