Seiko Cal. 6637 - 747

Seiko 6637-747

The 6637-747 is a sought-after Automatic piece from Seiko's golden era. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-e257d0dc5672]

Also known as: Tuna, Baby Tuna

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
34mm
Case Thickness
10.3mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Cream
Jewels
25j
Frequency
36,000 bph
Power Reserve
64 hours
Year
1966

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