Seiko Cal. 3840 - 740

The Seiko 3840-740 represents an important milestone in Seiko's 1974 lineup. Powered by the 3840 caliber with 32j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-275739975a1e]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1974

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