Seiko Cal. 6657 - 784

Seiko 6657-784

This Spring Drive model from 1965 features a 44mm Stainless Steel case. Powered by the 6657 caliber with 32j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-019350b9ae8c]

Also known as: Sumo, Arnie

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
44mm
Case Thickness
9.0mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
190m
Dial Color
White
Jewels
32j
Frequency
28,800 bph
Power Reserve
65 hours
Year
1965

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