The Seiko 7N42-8A20 is a watch model based on the 7N42 movement.
Parts List
| 310T48ANS0 | crystal - crystal |
| 310T48ANG0 | crystal - crystal |
| 8M35A0NNG1 | crown - crown |
| 8M35A0SNW1 | crown - crown |
| FH2981B01 | case back gasket - case back gasket |
| Z1481K-LKG | band - link |
| G1546J | band |
| Z1481J | band - band |
| Z1481K | band |
| Z1481K-BK1G | clasp - clasp |
| Z1481K-PB1 | clasp - parts for buckle/clasp |
| 3AA125F3ANS | others - second hand |
| 1AB080L2BLE | others - hour hand |
| 1AA085A0BAD | others - hour hand |
| 2AB125L0BLE | others - minute hand |
| 2AA125A0BAD | others - minute hand |
| 3AA125F3ANG | others - second hand |
| 3AA125F0ANS | others - second hand |
| 0351892 | others - winding stem |
| 82830140 | others - case ring |
| 7N428A2061Z | others - case |
| 82362629 | others - decorative bezel |
| 7N428A20 | others - case back |
| 82362621 | others - decorative bezel |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 7N423 | others - machine code |
| 7N428A2075Z | others - case |
| 7N428A6WXG14 | others - dial |
| 7N428A6WXS13 | others - dial |
| 7N428A78XS13 | others - dial |
| 7N428B1WXB13 | others - dial |
| 7N428B28XS13 | others - dial |
| A180BS | others - push pin |
| AD006BA12 | others - crown gasket |
| 2AB125L0BLA | others - minute hand |
| 12C52KBM | others - minute hand |
| 1AB080L2BLA | others - hour hand |
| 2AB120A6BLS | others - minute hand |
| 2AD120AMBAC | others - minute hand |
| 12C52KBH | others - hour hand |
| 1AB080A6BLS | others - hour hand |
| 1AC080A1BAC | others - hour hand |