I think that it is just verdigris and would be easy to remove, if you wanted.
It will clean up the surfaces, but will do nothing about the real problem below the surface.
Having used an ultrasonic cleaner for hundreds of coins, I can tell you with complete confidence it will not work for bronze disease.
This issue with •M• on reverse was only struck for Constantius II and Julian II.
Did you notify the seller?
Not all Vcoins dealers are the same; but there have been other topics about this dealer...a recent one--...
I couldn't resist :) [ATTACH]
Yes, the German Packaging Act has been in force for about three years. https://packhelp.com/german-packaging-act/
Did you check the "terms" as some dealers have all their shipping options listed.
Yes, there is...it's just not clear.
a few more [ATTACH] [ATTACH] [ATTACH] There is an I on altar for off. A and B; and an S on altar for off. gamma, delta, and epsilon.
You should try the "buy it now" fixed price listing on eBay. I have sold quite a few using BIN and they will automatically relist if they don't...
[ATTACH] Crispus A.D. 320 19x20mm 2.6g IVL CRISPVS NOB CAES Laureate and cuirassed bust left, spear pointing forward, shield with horseman...
I posted an example of this coin earlier in the thread, but this is an upgrade [ATTACH] Licinius I & Licinius II Ӕ nummus A.D. 318 21mm 4.2g D...
My two favorite Constantine coins from the Lugdunum (modern Lyon, France) mint. This mint was named after the Celtic sun-god, Lug or Lugh....
some Constantine from Arles [ATTACH] Constantine I A.D. 317- 318 20x21mm 3.9g IMP CONSTANTINVS P F AVG; laureate and trabeated bust left,...
Here are two from Heraclea that I think are interesting. They are both the same RIC number; but Constantine has a full beard on one and the other...
No...I just used a denture brush
It's a fantastic coin, especially considering it looked like this when I got it. [ATTACH]
Here is a Constantine from Sirmium. This reverse type was only issued for Constantine and only from the London, Lyon, Trier, Arles and Sirmium...
Separate names with a comma.