Seiko Cal. 4561 - 631

The Seiko 4561-631 represents an important milestone in Seiko's 1966 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-d2be203acde5]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Champagne

Jewels

23j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1966

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