The best looking Air-King I have ever seen with an unique Blue, non-Lavender dial that originally was grey. The rarity of this "defect" in a Rolex dial is insane and very impressive in person. You want unique colours? This is it. The watch has been polished previously and yet looks amazing. 
 
Details:
 
Brand: Rolex
Model: Air-King
Reference: 5500
Year: 1970
Material: Stainless Steel
Dimensions:  34mm
Crystal:  Plexiglass
Movement: Automatic Movement
Bracelet/Strap: Original 7205 Riveted Bracelet with 60 End Links
Box/Papers: No/No