1953 Ladies Rolex Chameleon Ad
The Rolex ad below from 1953 is fascinating in many ways. At the time, Rolex offered a ladies model referred to as the "Rolex Chameleon", which had a feature that allowed the user to almost instantly change the leather strap from one color to any other color. In many ways the Apple Watch which has a similar feature is reminiscent of this mid-century modern masterpiece.
Rolex offered many different versions of the Rolex Chameleon, and continued the model up through the late 1970s.
The Rolex Chameleon pictured below reminds me of an upside-down mini Reese's Peanut Butter Cup.