Nice rifle and, with no import marks, it must date to before 1964 for an import date. Those are really fine rifles in many cases, not abused in my experience with them. Some of the later Malaysian imports had more use, but nice rifles too.

I haven't seen one that nice, with a "full" stock (not sanded down) like that since I was at the Louisville show some 8-10 years ago. Last one I bought had been pretty heavily butchered with bayo lug ground off to make it safe for us dangerous civilians to use. It fixed up very nice with some original wood I brought back from scrap wood, but it will always be a refinish. Avoid the temptation to refinish if you want maximum value and originality.

The "T" I think is a proofing mark but only Mr. Laidlericon would be able to answer with authority.

Congrats on a great fine.