The Seiko 2C21-5490 is a watch model based on the 2C21 movement.
Parts List
| REEN19HN01 | crystal - crystal |
| 30NA7NA1 | crown - crown |
| 30NA7NS1 | crown - crown |
| 0G2710B02 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| GK08B | band - band |
| GK09B | band - band |
| 09P21AAH | others - hour hand |
| 09P21AAM | others - minute hand |
| 09P21NSH | others - hour hand |
| 09P21NSM | others - minute hand |
| 09SC31NS | others - second hand |
| 1AA060A3BAK | others - hour hand |
| 1AA060A3BNS | others - hour hand |
| 2AA085A3BAK | others - minute hand |
| 2AA085A3BNS | others - minute hand |
| 3BA125F1BNG | others - second hand |
| 3BA125F1BNS | others - second hand |
| 0351226 | others - winding stem |
| 2C215490BE | others - case |
| 82732810 | others - case ring |
| 2C215490F5 | others - case |
| 2C2110 | others - machine code |
| 2C211220XN19 | others - dial |
| 2C211220XS19 | others - dial |
| A150BS | others - push pin |
| 09SC31NG | others - second hand |
Caliber 2C21
