Seiko Cal. 6640 - 287

Seiko 6640-287

The 6640-287 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 32j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-218df9d1e69e]

Also known as: Tuna

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
40mm
Case Thickness
10.3mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
50m
Dial Color
Champagne
Jewels
32j
Frequency
36,000 bph
Power Reserve
39 hours
Year
1994

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