The Seiko Y491-4090 is a watch model based on the Y491 movement.
Parts List
| RE5N57AM10 | crystal |
| 80604199 | pusher |
Other models with the same movement
| Y491-4000 |
| Y491-4010 |
| Y491-4060 |
| Y491-4070 |
| Y491-4080 |
| Y491-4100 |
| Y491-4110 |
| Y491-4120 |
| Y491-4190 |
| Y491-4200 |
| Y491-5000 |
| Y491-500A |
| Y491-500B |
| Y491-500C |
| Y491-5010 |