Seiko Cal. 5257 - 391

This Spring Drive model from 1971 features a 40mm PVD Black case. Powered by the 5257 caliber with 36j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-f7efc4963210]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

200m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1971

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