LSMorgan said:
Show me a shipwreck coin that was forged in the period to avoid paying taxes, that's something I'm interested in buying, more so than a run of the mill "legit" cob from that same wreck.
In the 'ancient' world there is known "forgery's" (of the period) that DID circulate as valid coinage
called Barbarous (read more on that below) ..
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Barbarous Coinage of the Fourth Century
The term barbarous coinage refers to crude imitative coins.
There are numerous theories about the origins of these coins.
This page is only about VLPP imitative coinage in the Siscian style.
Different imitative coins from different times cannot all be explained
in the same way, because of different circumstances. The circumstances
in the early fourth century were unique. Some people believe that these
coins were made just to alleviate a coin shortage, but the diocese of
Hispaniae did not have a mint, and these coins rarely turn up there.
Others believe that these coins were issued as pay for the military on the
frontiers, but how long would Constantine have been able to issue inferior
coinage before the troops, who put him in office, decided to remove him
from power? Each of these theories may be right to some extent, but they
do not look at the whole picture. Firmicus Maternus, who lived in the
fourth century, even said that an alignment of the stars and planets
influenced forgery. Maternus was probably wrong, though!
http://www.constantinethegreatcoins.com/barb2/
http://www.constantinethegreatcoins.com/CONSTANTINE_THE_GREAT_THE_COINS_SPEAK.Pdf
see page 69