The Seiko 5Y30-5C90 is a watch model based on the 5Y30 movement.
Parts List
| REKN03JN01 | crystal |
| REKN03JN | crystal |
| 32M25NN1 | crown |
| 0H2700B01 | case back gasket - case back gasket |
| 0H2700B0 | case back gasket |
| G1362C-LKG | band - link |
| G1362G | band |
| G1362G-LKG | band - link |
| G1362C | band |
| G1362G-BK4G | clasp - clasp |
| G1362C-BK4S | clasp - clasp |
| 1BE055LABDG | others - hour hand |
| 1BA060A1BNG | others - hour hand |
| A120BS | others - push pin (for lb) |
| 5Y305C9025 | others - case |
| 5Y305F80XG14 | others - dial |
| 5Y305F90XB14 | others - dial |
| 5Y305F90XN14 | others - dial |
| 5Y305H80XG14 | others - dial |
| 5Y305H80XN14 | others - dial |
| 82830290 | others - case ring |
| 08T01DGM | others - minute hand |
| 0351671 | others - winding stem |
| EB0055B01 | others - crown and stem gasket |
| 09T13NGH | others - hour hand |
| 09T13NGM | others - minute hand |
| 08T01DGH | others - hour hand |
| 2BE085LABDG | others - minute hand |
| 2BA090A1BNG | others - minute hand |