Seiko Cal. 5657 - 399

The 5657-399 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5657 caliber with 20j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-83bebff4ed8d]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1985

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