Seiko Cal. 6257 - 431

The Seiko 6257-431 represents an important milestone in Seiko's 1968 lineup. Powered by the 6257 caliber with 23j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-6898bcd82eea]

Also known as: Monster, Tuna

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1968

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