Shaun you have a very nice 1960 Kodiak there, and you bought it at a really good price! That is some beautiful wood in the riser, especially the coin slab. You have purple heart in the site window, very rare. The compass is aftermarket but is installed very nicely and should not be a concern. I'd leave it alone. Hopefully the installer sealed the wood after the hole was drilled for the compass. Good luck, that is a keeper.