Seiko Cal. 4440 - 850

The Seiko 4440-850 represents an important milestone in Seiko's 1971 lineup. The Coin-Edge bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-99e1325efe77]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1971

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