Seiko Cal. 4438 - 677

The 4438-677 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4438 caliber with 25j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-43ea1102df8c]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

130m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1988

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