Seiko Cal. 6638 - 413

Released in 1965, the Cal. 6638 with design code 413 was part of Seiko's domestic market collection. It features a Champagne dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-aca67be37ee4]

Also known as: Sumo, Arnie

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

42mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

120m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1965

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