I thought I'd give my two cents on this coin, as I have some experience with
Byzantine monograms. The
obv. of this coin looks
fine to my eye, although the
rev. does have a modern feel, there's no way around it.
Still, I am curious about this:
1) you seem to have been in contact with Wolfgang
Hahn on the
monogram, and considering he's one of the world's foremost experts on
Byzantine coinage, I am very curious what he thought of this coin.
2) you mention it came from the soil, which is a pretty
good indication of authenticity. But how
good is this claim? Anybody can say that, and over the years I have seen dozens of modern
fakes that were 'found with a metal detector'.
Secondly, the
monogram.
1) it has a weird shape below the A. The seal you show does not convince me as a parallel because the vertical stroke makes no sense. Iota is pretty much always implied in the
monogram itself, and upsilon is always V, not Y in this time period. What did
Hahn say about that? To me, the only explanation (if genuine of course) is that it is an abbreviation mark, which occurs as an S shape or slash forward. I have found two
seals with a similar S below the A in Zacos/Veglery 1522a and b., but
still this is meagre evidence.
2) The
monogram can solve Pach/ for Pach(omios) but the name does make sense on a coin. It seems to be a name adopted by clergy. It can also solve Paul/ for Paul(os), but it would be weird with a duplicated V and I could find no parallels.
3) Pammach/ could fit as an acclamation for the emperor. It would be helpful if you knew any intstances where an emperor would be acclaimed 'Pammachos'. On itself, the solution would be anybody's guess.
Regards
Gert