Technical Flathead Cam

I just bought a 59A flathead that was hot rodded a long time ago, I took the distributor off to see what cam is in it and all it has is a stamped letter T. Is this stock? If not, what manufacturer? I couldn't find much online about it.

 

Is there a discernible 5 before the "T" 5T is a good torquey stock truck cam.
Oops fingers went too fast , check picture and the "t" is not the stock 5T mark .