Seiko Cal. 4437 - 686

The Seiko 4437-686 represents an important milestone in Seiko's 1967 lineup. Powered by the 4437 caliber with 32j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-60728f8d164d]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1967

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