Seiko Cal. 3857 - 820

The 3857-820 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3857 caliber with 31j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-8d767d280833]

Also known as: Panda, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1981

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