I agree with maridvnvm that the
Lugdunum looks consistent with artificial
silvering. (Great
reverse details! Left captive looks like
his arms are crossed, which is a
bit unusual. Could the elbows be bound? Is that a belt or a waist restraint?)
Based just on my experience, things that make me suspicious about
silvering:
Too uniform, even where it should've worn thin, no trace of luster (more "powdery"), no loss of
silvering over surface porosity/roughness,
silvering inside the
flan cracks, too bright (though, of course, artificial
silvering can be artificially
toned).
I think any of those could appear on genuine
silvering too, but they get my attention. It's also possible for any to be absent. I suspect that some use "silver leaf," which can give the appearance of
mint luster.
I also see lots of
Antoniniani (or Aurelianiani, I guess) that get me wondering. I have no idea how common it actually is. But it wouldn't surprise me if it's much more common than many of us realize.
This one from my "
captives"
gallery -- I could see it being ancient or modern
silvering:
https://www.forumancientcoins.com/gallery/displayimage.php?pid=180880Seller's photo:
https://www.acsearch.info/search.html?id=7646286In the following e-auction, the same seller (to their credit) described this one as "Artificially
silvered" (and gave the same
provenance as mine above):
https://www.acsearch.info/search.html?id=7854742Here's one other from
ACSearch, just in a quick
search for
auctions explicitly labeled as "artificial
silvering":
https://www.acsearch.info/search.html?id=540200EDIT:
These search results give 11 more examples, using the term "resilvered" instead:https://www.acsearch.info/search.html?term=resilveredOnly one listed prior sales. It had been photographed by 3 firms in ACSearch -- 2022, 2011, 2011. Not sure when the "resilvering" happened. The two older sales describe the silvering as original. The third definitely "looks" brighter, but maybe just lighting:
https://www.acsearch.info/search.html?id=9738917
https://www.acsearch.info/search.html?id=1105908
https://www.acsearch.info/search.html?id=1000651