The Seiko 2C21-5139 is a watch model based on the 2C21 movement.
Parts List
| ESSN85JN00 | crystal |
| 32N09NA1 | crown |
| 0F130NA11 | case back gasket |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| EDJ01G | band - leather band |
| EDJ02G | band - leather band |
| KDJ01G | band - leather band |
| 06S07DGH | hand - hour hand |
| 06S07DGM | hand - minute hand |
| 06SS03NG | hand - second hand |
| 2C210410XG14 | others - dial |
| 2C2110 | others - machine code |
| 2C21513925 | others - case |
| 82713210 | others - case ring |
| T080AS | others - push pin |
Caliber 2C21
