Seiko Cal. 3857 - 950

Released in 1970, the Cal. 3857 with design code 950 was part of Seiko's domestic market collection. Powered by the 3857 caliber with 22j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-ef1c06ac0a90]

Also known as: Sumo, Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Cream

Jewels

22j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1970

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