Seiko Cal. 6620 - 636

The Seiko 6620-636 represents an important milestone in Seiko's 1978 lineup. Powered by the 6620 caliber with 22j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-8323fae82ec1]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

44mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

170m

Dial Color

White

Jewels

22j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1978

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