Seiko Cal. 6637 - 340

Released in 1973, the Cal. 6637 with design code 340 was part of Seiko's domestic market collection. With its 20mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-c279ca54df5a]

Also known as: Arnie

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1973

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