Seiko Cal. 5640 - 508

The 5640-508 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-9f9539665824]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1972

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