The Seiko 8621-5120 is a watch model based on the 8621 movement.
Parts List
| RE6N97LN00 | crystal |
| 35NA3NJ1 | crown |
| 35NA3NA1 | crown |
| 0H2850B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
Caliber 8621
Other models with the same movement
| 8621-0010 |
| 8621-0011 |
| 8621-0030 |
| 8621-0040 |
| 8621-0050 |
| 8621-5000 |
| 8621-5001 |
| 8621-5009 |
| 8621-5010 |
| 8621-5019 |
| 8621-5020 |
| 8621-5080 |
| 8621-5081 |
| 8621-5090 |
| 8621-5100 |
| 8621-5110 |
| 8621-5130 |
| 8621-5170 |