I normally see Ron's signature under the cup/lid, but the signature can be easily forged.
Other things to look for?
How can you tell if it's really made by Ron?
Thanks.
The best way to tell is by looking at the workmanships.
In my line of work, I try to stay on top of things like these. As far as I know, I have never heard of any rumors, nor personally seen, anything regarding fake Thomas cases.
So, if you see a case with his signature in it, it is a real Thomas.
Someone is trying to sell me a 1X2, but there is no signature or any marking that related to Ron Thomas, it has no label at all.
Did Ron sign all his cases?