The first rule of gun trading should be: 1. Never sell a gun that pleases you and you shoot well until you own a gun that pleases you more and you shoot as well or better. If you don't feel comfortable evaluating the Hussey on your own, I would send it off to one of the smiths who have vast Brit gun backgrounds and get an opinion from him as to the quality of the example you have and how he would compare it to a similiar pre-WWI Purdey. If you are concerned about appreciation, consider that as the most highly recognized items leave the market, lesser names of equal (or better) quality will actually appreciate faster.