Seiko Cal. 6633 - 531

The Seiko 6633-531 represents an important milestone in Seiko's 1970 lineup. It features a Black dial protected by a Sapphire crystal and offers 70m of water resistance. [seikata-wm-ee1d7ddeeb67]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

21j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1970

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