Very nice, the early 1946, 1947 and possibly 1948 Brno1's did have a big font inspection mark on the barrel, at what seems a random position on the circumference, indicating that it was punched on prior to barrel fitup, see example;
a capital N was another I have seen, but never a full name, can you post a close up?
The magazine is actually an early model 2 magazine, the correct mag is the one on the left in this photo:
I can possibly swap it for a correct one if you are interested. Looks to be a very nice rifle all the same, thank goodness no idiot has threaded it for a moderator! One day I hope I will come across one, when/if I do I hope it will be the "De Luxe" checkered version, may as well stretch my luck!