Seiko Cal. 6636 - 704

Released in 1968, the Cal. 6636 with design code 704 was part of Seiko's domestic market collection. It features a Navy dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-dbad2be5792b]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

32j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1968

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