Seiko Cal. 6257 - 240

Released in 1969, the Cal. 6257 with design code 240 was part of Seiko's domestic market collection. Powered by the 6257 caliber with 26j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-5da482583ceb]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Cream

Jewels

26j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1969

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