Seiko Cal. 4440 - 257

The Seiko 4440-257 represents an important milestone in Seiko's 1986 lineup. Powered by the 4440 caliber with 30j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-ce1cd77cd193]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

8.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1986

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