The Seiko 2C21-0300 is a watch model based on the 2C21 movement.
Parts List
| 230A02JN02 | crystal - crystal |
| 230N21JN01 | crystal - crystal (inorganic) |
| 30N39NA1 | crown |
| 30N39NS1 | crown |
| 0G2150B01 | case back gasket |
| 0G2180B01 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| MN06A | band - band |
| MN01A | band - other band |
| PN220 | band - band |
| 10P53AGM | others - minute hand |
| 10P53ASM | others - minute hand |
| 10P55AGH | others - hour hand |
| 10P55ASH | others - hour hand |
| 10SC27T1 | others - second hand |
| 10SC27T2 | others - second hand |
| 3AA125F3A6S | others - second hand |
| 3AA125F3ANG | others - second hand |
| 0351226 | others - winding stem |
| 82719410 | others - case ring |
| 2C2103002F | others - case |
| 2C21030026 | others - case |
| 2C21030026A | others - case |
| 2C2103002FZ | others - case |
| 2C2110 | others - machine code |
| 2C211160XG19 | others - dial |
| 2C211160XS19 | others - dial |
Caliber 2C21
