Seiko Cal. 6684 - 643

The 6684-643 is a sought-after Solar piece from Seiko's golden era. Powered by the 6684 caliber with 22j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-bc7af7dea780]

Also known as: Sumo, UFO

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

44mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Champagne

Jewels

22j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1968

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