Seiko Cal. 6621 - 310

The Seiko 6621-310 represents an important milestone in Seiko's 1971 lineup. Powered by the 6621 caliber with 28j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-e294889a4ed1]

Also known as: Helmet, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1971

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