Nice rifle and the scope appears to be an old steel tube Weaver made in El Paso TX.
I'm not a M98 expert by any means but there is not enough pictures to tell, but the crest on the front receiver ring doesn't look like any Argentine I've seen. Take a picture of the left side of the receiver with the scope base removed. If it is a 1909 Argentine Mauser the bottom metal isn't correct for the rifle. Take a picture of the barrel markings as well.
Here is a link to a
1909 Argentine Mauser action. You'll see the crest isn't correct on the front receiver ring and that the trigger guard/bottom metal isn't correct. So I'd say your rifle isn't an Argentine Mauser and if it is it isn't the DWM 1909, which would be the most desireable one.
Some other things that might help you is that the scope you are talking about will not work on that rifle without paying a gunsmith to work on that rifle. To make it work you are going to need new scope bases to make any other scope work.Your current scope mount is a side mount and the rings that hold the scope just aren't tall enough for a scope like you are talking about, plus the main tube on most scope will not be long enough to work with your current base and rings.
The reason the power range of scope you are wanting to mount will not work, is because you objective lens will have to probably stay around 40mm or less to keep it from touching your barrel. The next reason is that is a long action and since the rear ring is so far forward and most modern scopes have much shorter main tube than your vintage scope. You probably couldn't get the eye relief correct to allow the proper field of vision through the scope.
So what you would more than likely have to do is remove the side mount scope. Take the rifle to a gunsmith and have him drill and tap bot receiver rings for a new base. That will usually run about $15-20 per hole minimum of three holes for a one piece base and four for a two piece, and around another $75-100 for the base and rings. Then you are looking at a minimum of $300 for a decent 6-24 power scope to put on there.
Next problem is your stock, it isn't a Monte Carlo stock, it is more of Classic hunting stock. If you have to go with a scope that will cause you to have to use medium to high rings your going to have problems getting the proper cheek weld unless you have a face like a horse. I think you'll have too much drop at the heel of your stock to keep your eye from getting proper alignment with any scope that has to be mounted higher.
Check out
Richard's Microfit sporter style stocks to see the difference. When you scroll down the page you'll see Monte Carlo and either the Old Classic or Modern Classic which your stock seems to be more of the last two. A Monte Carlo style stock would lend itself better to getting your eye in alignment with the scope if you have to mount it higher.
