Seiko Cal. 6620 - 388

The 6620-388 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6620 caliber with 33j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-bbbb03ab142d]

Also known as: Sumo, Silverwave

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1987

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