Seiko Cal. 3881 - 636

The 3881-636 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3881 caliber with 32j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-02bc2a18872d]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

32j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1974

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