So the tag has been cut out and was cut out when I received the shirt. I’d say it’s a Large in size though.
Thank you for responding and giving it a look for me!

I won this shirt through a vintage t shirt seller live auction and I have had it for some time. I have tried to research it, and have never been able to find not even one reseller selling the same exact shirt. Single stitch, cut out tag, definitely has faded, only worn an handful of times, overall ...