Seiko Cal. 6639 - 750

Released in 1969, the Cal. 6639 with design code 750 was part of Seiko's domestic market collection. Powered by the 6639 caliber with 26j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-f75dad32de35]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1969

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