Seiko Cal. 6639 - 761

Released in 1986, the Cal. 6639 with design code 761 was part of Seiko's domestic market collection. Powered by the 6639 caliber with 33j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-5bed223853fa]

Also known as: Shogun, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

11.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1986

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