Seiko Cal. 5660 - 727

The Seiko 5660-727 represents an important milestone in Seiko's 1967 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-1cc0dfec50e5]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1967

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