Seiko Cal. 6620 - 660

Released in 1974, the Cal. 6620 with design code 660 was part of Seiko's domestic market collection. It features a Green dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-8c03be1b2517]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1974

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