Seiko 4R36
Factory specs
- Caliber
- 4R36
- Made in
- Japan
- Frequency
- 21,600 bph (3 Hz)
- Power reserve
- 41 h
- Jewels
- 24
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- -35 / +45 s/day
- Diameter
- 27.4 mm
- Height
- 5.32 mm
- Functions
- Hours, Minutes, Seconds, Date, Day
- Equivalent to
- Seiko NH36A
- Same family
- Seiko NH35A, Seiko NH36A, Seiko NH37A, Seiko NH38A, Seiko NH39A, Seiko NH70A, Seiko NH71A, Seiko NH72A
Seiko-branded version of the NH36A trade caliber (day-date). Seiko's own product pages (e.g. SRPK87) give "Automatic with manual winding", "Stop second hand function", "Day/Date display", 24 jewels and a power reserve of approx. 41 hours. The beat rate (21,600 vph), dimensions (Ø27.4mm, 5.32mm high) are those of the NH36A on TMI's spec sheet; the -35/+45 s/day accuracy is Seiko's usual 4R-series figure, quoted second-hand (Seiko's product pages don't list it).
Watches with the Seiko 4R36
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Ocean Crawler Champion Diver (OC729) |
$999 | Seiko 4R36 | 44.2 | 15 | Sapphire | no bracelet |