What is the value of a holland and holland 12 gauge?

Answer 1

Go to Sotherbys, Christies and Bonhams websites and check through past auction results. Some include the guns serial numbers and date of manufacture which should give you a good idea.

Answer 2

Since they are one of a kind guns, the skies the limit. Teddy Roosevelt's H&H rifle sold at auction almost 20 years ago. It brought over $500 thousand.