Seiko Cal. 6635 - 991

Seiko 6635-991

The 6635-991 is a sought-after Hand-Winding piece from Seiko's golden era. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-e4708737f253]

Also known as: Golden Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
11.9mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
80m
Dial Color
Green
Jewels
31j
Frequency
28,800 bph
Power Reserve
66 hours
Year
1980

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