A couple of months ago I contacted Prof. T.V. Buttrey (Emeritus) at the Fitzwilliam Museum at Cambridge University about some images of Colosseum sestertii from additional auction catalogue references I had found. Prof. Buttrey is always helpful in providing images from the museum's excellent collection of auction catalogues to other scholars and collectors.Through the course of our discussions Prof. Buttrey learned I was managing the cast collection and the photo and auction catalogue archive at Frankfurt University with a colleague and told me that the Fitzwilliam had a number of duplicate catalogues they wanted to part with. I was happy to learn that he found several duplicates that would fill gaps in our collection. My colleague and I were astonished to learn a pallet with 280 kilograms of auction catalogues was waiting for us today! We have yet to begin accessioning these catalogues, but there is no doubt that this substantial donation, for which we are most grateful, will greatly improve our archive here in Frankfurt.
Image from coinarchives.com: Sestertius of Balbinus, AD 238, with Liberalitas reverse (Auction Adolph Hess, Lucerne and Gilhofer & Ranschburg, Vienna, 22. May 1935, lot 2613 = UBS Gold & Numismatics 78 (9. Sept. 2008), lot 1832).