Seiko Cal. 6331 - 758

The Seiko 6331-758 represents an important milestone in Seiko's 1978 lineup. Powered by the 6331 caliber with 25j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-d3d80262a5a9]

Also known as: Helmet, Crown

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

35mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Champagne

Jewels

25j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1978

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