The Seiko 7N42-8240 is a watch model based on the 7N42 movement.
Parts List
| 290P02LN03 | crystal - crystal (inorganic) |
| 8K45A3SNW0 | crown - crown |
| FE308BAA1 | case back gasket - case back gasket |
| 86620315 | crystal gasket - plastic gasket for crystal |
| 86620310 | crystal gasket - plastic gasket for crystal |
| 86620830 | bezel gasket - plastic gasket for bezel |
| AD006BAA1 | pusher - button gasket |
| 4724JB | band - band |
| 4724JB-LK2 | band - link |
| 4724JB-BKD | clasp - buckle |
| 4724JB-PB2 | clasp - parts for buckle |
| 2AB115L6BSB | others - minute hand |
| 1AB080L4BSB | others - hour hand |
| 3BA125F1BNS | others - second hand |
| 2AB115L6BSS | others - minute hand |
| 1AB080L4BSS | others - hour hand |
| 0351892 | others - winding stem |
| 82851310 | others - case ring |
| 7N42824061A | others - case |
| 82293999 | others - bezel |
| 7N428240 | others - case back |
| 7N42824061B | others - case |
| 0878580 | others - date dial |
| 7N423 | others - machine code |
| 7N429191XB13 | others - dial |
| 7N429191XS13 | others - dial |
| A180BS | others - push pin |