Seiko Cal. 4436 - 858

Seiko 4436-858

The 4436-858 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4436 caliber with 32j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-d92933f98e79]

Also known as: Monster, Sumo

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
12.8mm
Lug Width
21mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
60m
Dial Color
Black
Jewels
32j
Frequency
28,800 bph
Power Reserve
66 hours
Year
1966

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