Seiko Cal. 5640 - 373

The 5640-373 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5640 caliber with 21j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-506341b549e8]

Also known as: Flighty

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1989

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