Seiko Cal. 3817 - 220

The 3817-220 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3817 caliber with 18j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-7f992e6439e3]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1973

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