The Seiko 2Y00-5439 is a watch model based on the 2Y00 movement.
Parts List
| SAJN07JN01 | crystal |
| SAJN07JN | crystal |
| 32N23NA1 | crown |
| 32N23NN1 | crown |
| 0G1600B01 | case back gasket - case back gasket |
| 0G1650B01 | case back gasket - case back gasket |
| 0G1600B0 | case back gasket |
| B5520G | band |
| B5520G-BK3G | clasp - clasp |
| 05Y05NGH | others - hour hand |
| 2Y001910XS14 | others - dial |
| 2Y005439 | others - case back |
| 2Y00543925 | others - case |
| 2Y0065 | others - machine code |
| 82830670 | others - case ring |
| 0351236 | others - winding stem |
| 05Y05DGH | others - hour hand |
| DA007BA11 | others - crown and stem gasket |
| T060BS | others - push pin |
| 05Y05NGM | others - minute hand |
Caliber 2Y00
