Seiko Cal. 5240 - 381

The Seiko 5240-381 represents an important milestone in Seiko's 1975 lineup. Powered by the 5240 caliber with 26j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-87d0571ccfae]

Also known as: Tuna, Rally

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1975

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