Seiko Cal. 6648 - 653

The 6648-653 is a sought-after Hand-Winding piece from Seiko's golden era. The Coin-Edge bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-cb73ba9184c3]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1968

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