Seiko Cal. 6620 - 931

Released in 1966, the Cal. 6620 with design code 931 was part of Seiko's domestic market collection. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-2fffcb1fbda3]

Also known as: UFO, World Timer

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Burgundy

Jewels

19j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1966

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