Antique Burroughs Adding Machine. A friend of mine gave it to me some 20 years ago, so I don't know the history of it. Similar ones on ebay say they were made between 1920 and 1928 and are going for between $60 and $150. Very heavy ("portable" meant something very different back then) and it a really cool piece. Only get rid of it because I have nowhere to display it and someone else should enjoy it. It's a great gift for your history-loving accounting friend.