Seiko Cal. 5661 - 391

Seiko 5661-391

The Seiko 5661-391 represents an important milestone in Seiko's 1968 lineup. Powered by the 5661 caliber with 21j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-dce57efc6cdc]

Also known as: Monster, Sumo

Specifications

Movement
Solar
Case Material
Titanium
Case Width
44mm
Case Thickness
12.9mm
Lug Width
21mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
160m
Dial Color
Burgundy
Jewels
21j
Frequency
36,000 bph
Power Reserve
53 hours
Year
1968

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