Seiko Cal. 6331 - 100

The Seiko 6331-100 represents an important milestone in Seiko's 1965 lineup. Powered by the 6331 caliber with 26j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-c465343b9802]

Also known as: Panda, Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1965

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