Seiko Cal. 5640 - 139

The 5640-139 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5640 caliber with 22j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-5238acd188f0]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

41mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1978

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