Seiko Cal. 3875 - 550

The 3875-550 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3875 caliber with 21j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-6e65aa57a18e]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

13.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1970

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