Seiko 4R15 Movement Details
Seiko caliber 4R15 is an automatic watch movement. Production started around 2008.
| Power reserve: | 50 hours |
| Accuracy: | +45/-35 seconds/day |
| Day / date? | Date only |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | No |
| Rate: | 21,600 bph |
| Number of jewels: | 22 |
| Lift angle: | 53º |
| Size / diameter: | 27.0mm or 12" |
| Height: | 5.25mm |
| Notes: | Together with cal. 4R16, was intended as a replacement of the popular cal. 7S26. Also sold as NH15. |
| PDF guides: | Technical guide : 4R15A, 4R15B, 4R16A & 4R16B |
| Related movements: | 4R16 |
Part Codes
| Balance wheel code: | 310197 |
| Mainspring code: | 201164, 201267 |