Mark Blackburn (numismatist) Mark Blackburn (numismatist) Mark Alistair Sinclair Blackburn, (5 January 1953 – 1 September 2011) was a British numismatist and economic historian. He was Keeper of Coins and Medals at Fitzwilliam Museum from 1991 to 2011, Reader in Numismatics and Monetary History at the University of Cambridge from 2004 to 2011, and a Fellow of Gonville and Caius College, Cambridge from 2005. He was the President of the British Numismatic Society between 2004 and 2008. In 1983, Blackburn was elected a Fellow of the Society of Antiquaries of London (FSA). In 1989, he was elected a Fellow of the Royal Historical
Collect call from payphones. In the UK, a number of services offer reverse charge calling. A caller can dial the operator on 100 and ask for a reverse charge call, or alternatively dial an automated service such as 08000MUMDAD 08000686323, MUMDAD 686323 or 0800REVERSE 08007383773. Reverse charge calls can be made for free on some mobile networks, although the person being contacted via this service may be charged a considerable amount for accepting such a call. It is generally possible to make a collect call from a landline by dialing "0" and following automated prompts or using operator assistance. The receiving party