Seiko Cal. 4440 - 639

The Seiko 4440-639 represents an important milestone in Seiko's 1971 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-0c0077830659]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1971

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