The Seiko W309-5100 is a watch model based on the W309 movement.
Parts List
| ES3W40GN00 | crystal |
| AE0090BA | case back gasket |
| FH2882B0A | case back gasket - case back gasket |
| EA0090B0A | case back gasket - button gasket |
| 86563700 | crystal gasket - plastic gasket for crystal |
| 80612949 | pusher - button |
| 169LA | band - leather band |
| A200CS | others - push pin |
| W3090 | others - machine code |
| W30950909999 | others - panel cover |
| W309510061 | others - case |
| 81350480 | others - button spring |
| 83200101 | others - button spring clip |