If I remember right, the appraiser on "this old gun" said the value was in the upper 5 figures. Thankfully the owner has allowed it to be on display.
Tizzle, I'm with you. It would take awhile to pump it up, but with the number of full shots afterward, it would be worth it. The guy on the TV show that I watched said the group used it for small game to keep them in some meat.