You might pull the lock out and see if there is any identification stamps on the back side, also remove barrel from the stock and look at the underside the barrel for markings.
By looking at it, you can tell by inside the inletting if its inletted by hand or machine inletted (cutter tool marks).
If it has tool marks it could most likely be a replica non-firearm.
Check for a touch hole.
From what I understand, India has some pretty strict "Proof" laws based on the English Proof Laws.
However there is "loophole" in India Proof laws that these companys exploit. IF the gun is made WITHOUT the touchhole drilled in a flintlock, or the vent in a percussion arm; then the "Gun" isn't a "Gun" at all but falls into the category of an "Object-De-Art," and of course, you don't have to Proof Objects-De-Art!*
Indian Object-De-Art muskets use substandard seemless steel tubing that runs a high risk of blowing up if fired as a muzzleloader.