It looks like an item in the same vein as these, a sample to show important people their new idea. All the cans in that picture were produced to show to the breweries and soda companies that might want to use their cans. Probably the same type of thing.
They're usually not rare, though I'm not sure why they made as many as they did. A good-sized collection of sample cans or bottles could be put together for a low price. HOWEVER, others, like the can in the 2nd picture, are very rare and valuable. There are only 3 of those known and they sell for upwards of $1500.
Calling the museum would be a good idea. Maybe you can even call Thatcher Co.?