Seiko Cal. 6636 - 730

The Seiko 6636-730 represents an important milestone in Seiko's 1991 lineup. Powered by the 6636 caliber with 22j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-21f25258166a]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Cream

Jewels

22j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1991

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