Seiko 4R36 caliber vs Seiko 6R15 caliber: specs compared
Updated 05 September 2026.
5
specs differ
Seiko 4R36 caliber and Seiko 6R15 caliber differ on 5 specs: movement height, jewels, calendar / layout, stem, power reserve.
| Spec | Seiko 4R36 caliber | Seiko 6R15 caliber |
|---|---|---|
| Maker | Seiko | Seiko |
| Size | 12 ligne | 12 ligne |
| Casing diameter | 27.40 mm | 27.40 mm |
| Movement height | 5.32 mm | 5.25 mm |
| Frequency | 21,600 A/h (3 Hz) | 21,600 A/h (3 Hz) |
| Jewels | 24 | 23 |
| Winding | automatic, bidirectional, hacking and hand-wind | automatic, bidirectional, hacking and hand-wind |
| Calendar / layout | centre seconds, day and date at 3 | centre seconds, date at 3 |
| Hand fitting | hour 1.50 / minute 0.90 / second 0.20 mm (bore) | hour 1.50 / minute 0.90 / second 0.20 mm (bore) |
| Stem | 4R36 stem | 6R15 stem |
| Power reserve | approx. 41 h | approx. 50 h |
Questions and answers
How do Seiko 4R36 caliber and Seiko 6R15 caliber compare?
Seiko 4R36 caliber and Seiko 6R15 caliber differ on 5 specs: movement height, jewels, calendar / layout, stem, power reserve.