Well. The large quantity of
fakes existent of the
medieval pennies is the biggest in the
history, overall due the simplicity to copy. It's just enought 2D in the mayor
part.
In Dpain is true come many copies from, but usually very bad
quality.
In USA they make many dies of very popular coins there. The 1715 fleet were one of the
hoard more widely copied in the world.
There are
still many famous forgers UK/US that
still now are a source of
counterfeits by thousands, for example
Becker (
still one of the most replicated as original),
Other big producer of sources of
fakes is Westair Reproductions Ltd, that although mark with
WRL the coins, this is erased easily from the
cast models in wax.
In UK the governmet have estimated that the 1% of the current coins circulating were
fakes (of 1 Pound)
Of course
fakes affect all the countries, but is also evident the coins more colectables are the most forget. That is
Romans, Greek, UK and USA
None is so easy to
fake an old penny, well not, a merovingian are very easy also, but very few collect them.
I do not have data of other high population countries like Rusia or
China, but I imagine they are also prominent. I know at least
china busted a big gang dedicated only to
fake USA coins.