Seiko Cal. 6640 - 541

The 6640-541 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6640 caliber with 25j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-f4075b608ddb]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

12.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1999

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