Ghost07, I think you are right about the scope. I did a little research online and it seems to be a legit M73b1 (Type III). The markings are a little different than the earlier M73b1's and do not include the Weaver name. Check these links out:
https://www.milsurps.com/showthread.php?t=51886&page=1
M73B1 Type I, II, III? | Gunboards Forums