The Seiko 2C21-0280 is a watch model based on the 2C21 movement.
Parts List
| 170W03HN00 | crystal |
| 32M15NS1 | crown |
| 32M15NA1 | crown - crown |
| 0F135BAA1 | case back gasket |
| 0F135BAA | case back gasket |
| 86564710 | crystal gasket - plastic gasket for crystal |
| 86564770 | bezel gasket - plastic gasket for bezel |
| B5298S | band - metal band |
| B5298S-LKS | band - link |
| Dbl. 97.--DM | band |
| St. 70.--DM | band |
| Bicolor NL | band |
| B5298S-PB1 | clasp - parts for buckle/clasp |
| B5298S-BK4S | clasp - clasp |
| 07S25DSH | hand - hour hand |
| 07S25DSM | hand - minute hand |
| 07SS03NS | hand - second hand |
| 2C210190XS13 | others - dial |
| 2C21028087 | others - case |
| 2C2110 | others - machine code |
| 82330735 | others - bezel |
| 81180229 | others - bracelet fixing pipe |
| 81181459 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 81606899 | others - bracelet fixing pin |
| 83139430 | others - case ring |
| EB0055B01 | others - crown and stem gasket |
| EB0055B0 | others - crown gasket |
Caliber 2C21
