https://www.ngccoin.com/news/article/6810/counterfeit-detection-september-2018/ If it looks to good to be true - it takes a scrutinizing second look.
Since the "real ones" are a little "dirty" can they be "conserved" for cosmetic purposes or is a no, no?
Sal, A soak of a few minutes in acetone shouldn’t harm the coin at all. A few minutes is all that’s needed to loosen any grime, then roll an acetone-wetted Q-tip gently (no rubbing!) to get it off. A few seconds of air-drying allows any leftover acetone to evaporate. Some folks then use some distilled water to dampen and then blot with a microfiber cloth, the kind used on eyeglass lenses. This is for the authentic steels. The reprocessed coins are beyond hope.
I've got 1-2 rolls of 43s and a few renewed/plated ones as well Not all the real ones are dirty and dull but I wouldn't buy an uncertified one that was or not likely You want a "real" pretty one be prepaired to pay for it...
Just soak for a short time in acetone. No rubbing. They look to be in decent shape so I wouldn’t mess with them.