Seiko Cal. 4437 - 156

The Seiko 4437-156 represents an important milestone in Seiko's 1981 lineup. It features a Green dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-ee911390f31a]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

13.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1981

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