ebay is good, once bought a a good load of them... and found a Rhodesia key date sixpence. not bough a load for a long while, everyone catches onto them and pays a fair bit on bulk on ebay now.
a 2,500 euro coin or book or stamp? erm... yea. of archaeological value? whats that even? does that mean anything dug up and worth 100 euros? that could fit in with coins, and the market for WW2 german items.
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.