Contact Simpson Ltd., I have bought and sold thru them, never had an issue and they have sold a number of firearms for me that were collectable pieces and received the price that I wanted for them. They sell on commission and do all the work. They have a very large internet audience and a brick and mortar store. Give them a call, they may purchase the whole collection.
simpsonltd.com
Tim
Simpson Limited | Antique & Modern Firearms
Simpson Limited: A trusted family-owned store since 1962, specializing in antique and modern firearms, unique collectibles, and premium accessories.
Tim