The Belgians sold a lot of Mausers to Israel in the 50ies. Those Mausers had a very distinct stock: solid beech, take down hole in the cupped buttplate, no common band spring, not drilled for cleaning rod. All this applies to your stock.
The visible hole in the upper band is a bit widened to accept the bolt that holds it in place.
This crown/RC marking is interesting indeed. I wonder what if could be if it's not the Imperial mark? Could you please show us a pic of the other side of the ring, with or without any number, and the rear lower part of the ring so that we could see if a hook has been removed? The IDF would have surely done this, I think. Thanks in advance!