Seiko Cal. 6647 - 731

Seiko 6647-731

The 6647-731 is a sought-after Solar piece from Seiko's golden era. Powered by the 6647 caliber with 34j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-06b862606ea1]

Also known as: Baby Tuna

Specifications

Movement
Solar
Case Material
Gold-Plated
Case Width
44mm
Case Thickness
15.7mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Black
Jewels
34j
Frequency
36,000 bph
Power Reserve
51 hours
Year
1991

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