The Seiko Y789-5100 is a watch model based on the Y789 movement.
Parts List
| BA1W78GN00 | crystal - crystal |
| FH2882B0A | case back gasket - case back gasket |
| EA0090B0A | case back gasket - button gasket |
| 86564220 | crystal gasket - plastic gasket for crystal |
| 80613169 | pusher |
| QA80A | band - band |
| Y789510062 | others - case |
| A200CS | others - push pin |
| 81350480 | others - button spring |
| 83200101 | others - button spring clip |