Seiko Cal. 6640 - 545

Seiko 6640-545

The 6640-545 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6640 caliber with 24j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-a93cc8f3f745]

Also known as: Monster, Sumo

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
38mm
Case Thickness
8.5mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
160m
Dial Color
Silver
Jewels
24j
Frequency
21,600 bph
Power Reserve
50 hours
Year
1967

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seikata-wm-a93cc8f3f745