Seiko Cal. 5655 - 640

Released in 1965, the Cal. 5655 with design code 640 was part of Seiko's domestic market collection. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-ff13ce972230]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

12.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1965

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