Seiko Cal. 3866 - 657

The 3866-657 is a sought-after Automatic piece from Seiko's golden era. With its 20mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-678cbc7ca091]

Also known as: Sumo, Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

10.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1984

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