The Seiko 3421-527B is a watch model based on the 3421 movement.
Parts List
| ES1W86GM03 | crystal - crystal |
| 30M22NS1 | crown - crown |
| 0H1860N01 | case back gasket - case back gasket |
| 86176710 | crystal gasket - plastic gasket for crystal |
| DS16A | band - band |
| 07T12DSH | others - hour hand |
| 07T12DSM | others - minute hand |
| A110BS | others - push pin (for mb) |
| 34210640XS13 | others - dial |
| 34211 | others - machine code |
| 0354546 | others - winding stem |
| 83118650 | others - case ring |
| 3421527B61 | others - case |
| 08SC14NS | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 3421
