Seiko Cal. 5617 - 766

Released in 1977, the Cal. 5617 with design code 766 was part of Seiko's domestic market collection. The Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-bd64ac0f07ac]

Also known as: Bullhead, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

26j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1977

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