Seiko Cal. 3875 - 550

Seiko 3875-550

The 3875-550 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3875 caliber with 21j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-6e65aa57a18e]

Also known as: Sumo

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
13.3mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
170m
Dial Color
Navy
Jewels
21j
Frequency
36,000 bph
Power Reserve
72 hours
Year
1970

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