Seiko Cal. 3870 - 820

This Spring Drive model from 1965 features a 46mm Titanium case. It features a Black dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-8b0ebec3341b]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1965

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