Seiko Cal. 4438 - 879

The 4438-879 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4438 caliber with 33j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-817ae737ae41]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1972

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