Seiko Cal. 4557 - 765

The Seiko 4557-765 represents an important milestone in Seiko's 1965 lineup. Powered by the 4557 caliber with 25j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-727867d4ba31]

Also known as: Helmet, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

White

Jewels

25j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1965

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