Seiko Cal. 6240 - 742

The 6240-742 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6240 caliber with 34j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-a284e6c239bd]

Also known as: Turtle, Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1979

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