We for sure found that it is made by the Thatcher Glass Company. Haven’t been able to find a picture of anything similar. Has two designs around the bottom- one has an anchor in the middle and I can’t discern the other.
I’m starting to get into this. I found an old 1940’s bottle of root beer in the sand underwater off of Elliott Key. Was easy to identify just by Googling the numbers cast into it.
Then I find this in the sand bar off of Vizcaya, the mansion in Miami once owned by James Deering of the McCormick...