ORIGINAL: Bozack66
Your rifle is a Finish one made by Sako as indicated by the "S" for the Finish Army as indicated by the boxed "SA". The hexagon receiver is more desirable than the round. The M39 are said to be more accurate than the Russian M44's and M38's. I would shoot it with out the scope and see how it does. If you still desire the scope then put one on that does not alter the rifle and the rifle can be returned to original condition. This rifle is going up in value for sure and you don't want to ruin it.
I agree, and you can purchase a bolt body section that has a turned-down bolt handle, take the bolt apart and replace the body section with the one that has the altered handle, and save the original bolt body. Then, later on, you can restore the bolt to original condition and the whole rifle will then be original.