Seiko Cal. 6637 - 793

Released in 1998, the Cal. 6637 with design code 793 was part of Seiko's domestic market collection. Powered by the 6637 caliber with 20j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-3da707bd4888]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1998

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