The Seiko 7N42-7A40 is a watch model based on the 7N42 movement.
Parts List
| 280W56GN00 | crystal |
| 8M35A0NNG1 | crown - crown |
| 0A2600N01 | case back gasket - case back gasket |
| 86570560 | crystal gasket - plastic gasket for crystal |
| 86178600 | bezel gasket - plastic gasket for bezel |
| B1847L | band |
| B1847L-LKG | band - link |
| B1847L-PB1 | clasp - parts for buckle/clasp |
| B1847L-BK1S | clasp - clasp |
| 3AA125F1ANG | others - second hand |
| 3AA125F0ANG | others - second hand |
| 1AA080A1BNG | others - hour hand |
| 2AA115A1BNG | others - minute hand |
| 0351892 | others - winding stem |
| 82830140 | others - case ring |
| 82283441 | others - bezel |
| 0878580 | others - date dial |
| 7N423 | others - machine code |
| 7N427A40 | others - case back |
| 7N427A4098Z | others - case |
| 7N427A6WXS14 | others - dial |
| 7N427B28XS14 | others - dial |
| A180BS | others - push pin |
| AD006BA12 | others - crown gasket |
| 2AB125F0BLG | others - minute hand |
| 1BB085F0BLG | others - hour hand |