Seiko Cal. 3870 - 820

The Seiko 3870-820 represents an important milestone in Seiko's 1967 lineup. It features a Green dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-a1bbf915f0a8]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

23j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1967

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