Seiko Cal. 6637 - 827

Seiko 6637-827

Released in 1990, the Cal. 6637 with design code 827 was part of Seiko's domestic market collection. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-b677daa6e60e]

Also known as: Tuna, UFO

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
35mm
Case Thickness
15.3mm
Lug Width
22mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
140m
Dial Color
White
Jewels
27j
Frequency
28,800 bph
Power Reserve
45 hours
Year
1990

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