I'll add this back in since this is a catch-all thread for RT's and very late T's and whatnot...
Fug shared this with us 5 years ago. I'd forgotten about it.
A 99RT forearm with a 1935 serial number stamped on it and the letters "EG".
So was this a leftover T forearm finished and checkered for an RT ten years later, or was there a 1935 rifle (99T?) sent back in for restocking when they were doing the RT's and they stamped it's number on the end?