Seiko Cal. 5640 - 197

The 5640-197 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-6885d0157058]

Also known as: UFO, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1965

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