This was the official t-shirt from Universal Pictures that was used to promote the release of the film in 1978.
The shirt is in very good condition considering it’s age.
I have recently acquired a large collection of vintage promotional t-shirts from a movie distributor. The majority of these shirts are from 1974-1984 and have been in a storage unit for 40+ years. While researching these designs, I have found that many of them have never been listed on eBay before.