Seiko Cal. 4537 - 644

The Seiko 4537-644 represents an important milestone in Seiko's 1983 lineup. Powered by the 4537 caliber with 22j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-2b34a00c6d17]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

12.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1983

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