Seiko Cal. 6311 - 997

The Seiko 6311-997 represents an important milestone in Seiko's 1972 lineup. Powered by the 6311 caliber with 21j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-87a8f650c5ec]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Silver

Jewels

21j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1972

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