Seiko Cal. 6257 - 306

The Seiko 6257-306 represents an important milestone in Seiko's 1976 lineup. Powered by the 6257 caliber with 24j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-4c0f11e60b4b]

Also known as: Sumo, Shogun

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

24j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1976

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