McDonald's cheapest set of 2 commemorative glasses in 1981

Muppet Premiums, Great Muppet Caper Merchandise, McDonald's, and 2 more
The Great Muppet Caper glasses (McDonald's)
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McDonalds Caper glasses commercial
TV commercial

McDonald's made a set of commemorative glasses in 1981 to promote The Great Muppet Caper with illustrations by Daryl Cagle.

The two glasses include:

Kermit on a bicycle

The Muppets on the Happiness Hotel bus