Seiko Cal. 6637 - 726

The Seiko 6637-726 represents an important milestone in Seiko's 1981 lineup. Powered by the 6637 caliber with 24j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-727c5ecd0cbb]

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

44mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

White

Jewels

24j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1981

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