It was made by the crew when filming commenced on A New Hope. There were very few….this was the working title of the film “Transcelestians” (similar to Blue Harvest but much more obscure). This shirt was actually owned by Ben Burtt (4 time academy award winning sound designer). You know the guy who invented the Darth Vader breathing sound….
Rarest T-shirt on Earth
Rarest T-shirt on Earth (saved image)