how is that law going to even work. you buy something that's been in someones loft for years off ebay.. that happens to have something worth that much money in it. German laws? some things are banned under German law that people collect though. how would those fit in?
http://www.londoncoins.co.uk/?page=Pastresults&searchterm=Farthing+1671+Pattern&category=9&searchtype=1 quick google later, London coins has a 1671 farthing with picture doesn't position of the 1 doesn't match whatever is under the 2.