The Seiko Y621-6040 is a watch model based on the Y621 movement.
Parts List
| 40M0HNS1 | crown - crown |
| WA29DE | band - band |
| 3BA125F1BFR | others - second hand |
| Y6216040N0A | others - case |
| A150BS | others - push pin |
| 83137855 | others - case ring |
| 11B87FRH | others - hour hand |
| 11B87FRM | others - minute hand |
Other models with the same movement
| Y621-6000 |
| Y621-6010 |
| Y621-6020 |
| Y621-6030 |
| Y621-6050 |
| Y621-6060 |
| Y621-8000 |
| Y621-8010 |
| Y621-8020 |
| Y621-8030 |
| Y621-8040 |