Seiko Cal. 6231 - 509

The Seiko 6231-509 represents an important milestone in Seiko's 1973 lineup. Powered by the 6231 caliber with 33j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-9d14fc111ce9]

Also known as: Turtle, Bullhead

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Green

Jewels

33j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1973

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