Seiko Cal. 6642 - 658

The 6642-658 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6642 caliber with 32j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-9039c52c185f]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

White

Jewels

32j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1982

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