Seiko Cal. 3817 - 185

The Seiko 3817-185 represents an important milestone in Seiko's 1971 lineup. Powered by the 3817 caliber with 30j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-7f046d7f0844]

Also known as: Bellmatic, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1971

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