During the interregnum after the death or resignation of a Pope, the Vatican switches to an alternative coat-of-arms; its postal administration “prepares and issues special postage stamps for use during this particular period, known as ‘sede vacante stamps’”; and it mints commemorative Euro coins marked with the arms of the "Cardinal Chamberlain" (Camerlengo). A 2008 change in Eurozone guidelines means that the next time this happens, the coins will not be legal tender outside the Vatican City (the same is true of the Pope).
There are opportunities here for a great heist movie but it is crucial for the story-line to include Michael Caine and a small fleet of Mini Minors.
Sorry, did I say "minor"? Not intending to trigger anyone.
¹ Title suggested by M. Bouffant in comments