The Seiko 9021-5100 is a watch model based on the 9021 movement.
Parts List
| RE6N24GN00 | crystal |
| SA6W44GN00 | crystal - crystal |
| 30R22NA1 | crown |
| 30M22NA1 | crown - crown |
| 30R22NS1 | crown - crown |
| 0A2600N01 | case back gasket - case back gasket |
| 0E280NA1S | case back gasket - rotating bezel gasket |
| 86571180 | crystal gasket - plastic gasket for crystal |
| NK43A | band - band |
| 10T04N1M | others - minute hand |
| 0354856 | others - winding stem |
| 9021510075 | others - case |
| 10T04N1H | others - hour hand |
| 90215140XG14 | others - dial |
| 90219 | others - machine code |
| A170BS | others - push pin |
| 82722620 | others - case ring |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 9021
