The Seiko 8N40-5040 is a watch model based on the 8N40 movement.
Parts List
| ES0A07SN01 | crystal |
| 6M25Z5NNGA | crown |
| 0H2600B01 | case back gasket - case back gasket |
| 81922811 | clasp - clasp |
| 82842590 | others - case ring |
| 8N4013 | others - machine code |
| 8N405040 | others - case back |
| 8N40504025A | others - case |
| 8N405060XG14 | others - dial |
| DZ0040B01 | others - crown and stem gasket |
| 0351388 | others - winding stem |
| 11TA5JCH | others - hour hand |
| 11TA5JGM | others - minute hand |
Other models with the same movement
| 8N40-5000 |
| 8N40-5010 |
| 8N40-5030 |
| 8N40-5050 |
| 8N40-5060 |
| 8N40-5080 |
| 8N40-6000 |
| 8N40-6010 |
| 8N40-6020 |
| 8N40-6030 |
| 8N40-6040 |
| 8N40-6050 |
| 8N40-6060 |
| 8N40-6070 |
| 8N40-6080 |
| 8N40-608A |
| 8N40-6090 |