Seiko Cal. 6631 - 225

The Seiko 6631-225 represents an important milestone in Seiko's 1968 lineup. Powered by the 6631 caliber with 19j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-96d52a9070a1]

Also known as: Arnie

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Green

Jewels

19j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1968

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