Seiko Cal. 6657 - 331

Seiko 6657-331

The 6657-331 is a sought-after Automatic piece from Seiko's golden era. With its 18mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-4b37051facb3]

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
38mm
Case Thickness
11.9mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
90m
Dial Color
Champagne
Jewels
23j
Frequency
36,000 bph
Power Reserve
66 hours
Year
1971

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