Seiko Cal. 4438 - 879

Seiko 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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seikata-wm-817ae737ae41