Seiko Cal. 6645 - 688

The 6645-688 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6645 caliber with 25j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-fa40ce940bc5]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1999

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