Yes except polyurethane can be scratched, and once its scratched, it cannot be repaired without refinishing the entire stock. IMHO Polyurethane is the worst thing you can put on a fine piece of wood.

Tru-Oil will give a finish similar looking to polyurethane, but you can touch it up very easily if it gets scratched.

The ultimate finish if its a nice piece of wood would be the French Polish method which involves wiping on a thinned shellac/oil mix in several coats- its absolutely brings out the beaty of wood, and is easily repaired/ touched up.