Seiko Cal. 6638 - 731

Seiko 6638-731

The 6638-731 is a sought-after Solar piece from Seiko's golden era. Powered by the 6638 caliber with 20j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-eae8151c6b02]

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
8.5mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
120m
Dial Color
White
Jewels
20j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1977

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