Seiko Cal. 6638 - 616

The 6638-616 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 31j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-5cf43bf7115a]

Also known as: UFO

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1981

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