There was a beautiful rising bite Rigby .450NE for sale at Julia's last sale with an estimate at around that price. It dated from 1902 and was virtually mint. I saved the photos, but it may still be on their website too. Its the only one I've seen offered on the open market in that condition offered for quite a while but in a 2 year time-frame you should find something. You probably need to speak to someone with contacts among collectors. If its for a pension investment, you can also buy and sell, each time adding funds and improving the quality of the pieces you buy...