Door handles acquired! Thank you Chriskingbees!
Thanks and kudos to chriskingbees -- I now have two authentic door handles from the U.K.! The transaction went flawlessly, and the only issue is that the handles were brass, not nickel. After much research I decided to save the environment and have a shop nickel plate the handles for me, which they were able to do in just a few days (total cost $10 per handle). Here is a pic of the final product!