David: You have gotten a lot of good advice here, but I'm going to give you my two cents anyway. I love my guns. To me they are works of art and if they could tell their story you could be entertained for as long as you live. I had my romance with the stock market years ago. I was a broker as well as an investor. I finally figured out that investing in the market was a lot like going to Las Vegas except you didn't get free drinks and a floor show while you were losing your money. With the stock broker like Vegas, THE HOUSE ALWAYS WINS.
Now I invest in land and guns because I have never lost money with either. You have to be smart when you're buying especially in something like Best English SxSs. Read a lot about them, talk with knowledgeable dealers. One that comes to mind is Diggory Hadoke who posts on here as "smallbore". Check the auction sites such as Holts, Bonhams & Gavin Gardiner and see what kind of appreciation various makers have had over time. In other words, become a student.
Best Regards, George