Sinner:
Roosevelt's Holland .500/.450 was the gift of 60 British admirers led by Edward Buxton. The donors included some of England's most prominent and respected men and women: naturalists, clergy, nobility, military officers, members of parliament, and F.C.Selous! Their names were recorded on a label attached inside the case next to the H&H trade label.

The rifle remained part of the Roosevelt Estate from TR's death in 1919 till 1948, when it passed to the family of his son Kermit. When Kermit's wife died in 1969, the gun passed through several owners until acquired by antiquarian/collector Greg Martin. Martin had the forend replaced for the film "In The Blood" as the original had been lost in the 1940s.

In 1987, Martin sold the gun to William E. Simon, former Secretary of the Treasury. That brings us up to 1990 where my reference ends, but I clearly remember the more recent auction record of a million bucks or thereabouts, referred to by Sinner above, was big news at the time.