Seiko Cal. 5661 - 770

The Seiko 5661-770 represents an important milestone in Seiko's 1966 lineup. Powered by the 5661 caliber with 32j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-f262d2223dab]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1966

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