Seiko Cal. 6637 - 646

Released in 1993, the Cal. 6637 with design code 646 was part of Seiko's domestic market collection. With its 21mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-85ed19fe7598]

Also known as: Tuna, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

11.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1993

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