Seiko Cal. 5640 - 512

The 5640-512 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5640 caliber with 32j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-65c65a547882]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Burgundy

Jewels

32j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1969

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