Seiko Cal. 6637 - 748

Released in 1981, the Cal. 6637 with design code 748 was part of Seiko's domestic market collection. It features a Cream dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-7cc9083de7a6]

Also known as: Tuna, World Timer

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

24j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1981

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