Seiko Cal. 5663 - 667

The 5663-667 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-6c66a3b5d8a4]

Also known as: UFO, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1983

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