Seiko Cal. 5640 - 316

The 5640-316 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5640 caliber with 19j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-02fe5247079f]

Also known as: Turtle

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

19j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1973

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