Seiko Cal. 6620 - 639

Released in 1965, the Cal. 6620 with design code 639 was part of Seiko's domestic market collection. It features a Navy dial protected by a Sapphire crystal and offers 80m of water resistance. [seikata-wm-b6a3bb282dd1]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

9.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1965

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