Seiko Cal. 5661 - 555

The Seiko 5661-555 represents an important milestone in Seiko's 1970 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-653a931d8f25]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

44mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Silver

Jewels

23j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1970

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