Seiko Cal. 6640 - 807

Seiko 6640-807

The 6640-807 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 31j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-215ec43ffffe]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
40mm
Case Thickness
11.2mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
70m
Dial Color
Champagne
Jewels
31j
Frequency
28,800 bph
Power Reserve
51 hours
Year
1978

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