The Seiko 2C20-5850 is a watch model based on the 2C20 movement.
Parts List
| ESTN59AN | crystal |
| ESTN59AN00 | crystal |
| 30N77NA1 | crown |
| DZ0065B01 | case back gasket - button gasket |
| 0G1850B01 | case back gasket |
| D5021G | band - metal band |
| D5021G-LKG | band - link |
| D5021G-BK4G | clasp - clasp |
| 07R39DGH | hand - hour hand |
| 07R39DGM | hand - minute hand |
| 2C2010 | others - machine code |
| 2C201760XS14 | others - dial |
| 2C201760XY14 | others - dial |
| 2C201770XG14 | others - dial |
| 2C201770XL14 | others - dial |
| 2C20585025 | others - case |
| 82715050 | others - case ring |
| B090AS | others - push pin |
| A_Welle | others |
| 1CA045A1BNG | others - hour hand |
| 07R03DGM | others - minute hand |
| 2CA065A1BDG | others - minute hand |
Caliber 2C20
