Seiko Cal. 6620 - 257

The Seiko 6620-257 represents an important milestone in Seiko's 1982 lineup. Powered by the 6620 caliber with 30j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-05a08f6066b2]

Also known as: Crown, Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

43mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1982

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