Seiko Cal. 5661 - 670

Released in 1975, the Cal. 5661 with design code 670 was part of Seiko's domestic market collection. It features a Silver dial protected by a Acrylic crystal and offers 160m of water resistance. [seikata-wm-a9ddba2ec01c]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1975

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