Seiko Cal. 7155 - 636

The 7155-636 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7155 caliber with 25j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-463da6c882ad]

Also known as: Sumo, Navigator

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

120m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1989

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