The Seiko 2C20-0450 is a watch model based on the 2C20 movement.
Parts List
| 200W79HN00 | crystal |
| 200P05HN03 | crystal - crystal (inorganic) |
| 30M17NA1 | crown |
| 0F160BAA2 | case back gasket |
| 86571830 | crystal gasket |
| 86571910 | bezel gasket - plastic gasket for bezel |
| BJA29G | band - resin band |
| BJA29G-LB | band - leather without buckle |
| BJA29G-BK4G | clasp - clasp |
| A130AS | others - push pin (for lb) |
| EB0055B01 | others - crown and stem gasket |
| 2C20045075 | others - case |
| 2C2010 | others - machine code |
| 2C202740XG14 | others - dial |
| 8242019A | others - bezel |
| 200W79HN00 | crystal |
| 200P05HN03 | crystal - crystal (inorganic) |
| 30M17NA1 | crown |
| 0F160BAA2 | case back gasket |
| 86571830 | crystal gasket |
| 86571910 | bezel gasket - plastic gasket for bezel |
| BJA29G | band - resin band |
| BJA29G-LB | band - leather without buckle |
| BJA29G-BK4G | clasp - clasp |
| A130AS | others - push pin (for lb) |
| EB0055B01 | others - crown and stem gasket |
| 2C20045075 | others - case |
| 2C2010 | others - machine code |
| 2C202740XG14 | others - dial |
| 8242019A | others - bezel |
Caliber 2C20
