The weights stated in Krause for peninsular Spain 2 Reales (milled shield aka "pistareens"... and bust) are, as discussed previously on here, patently incorrect. While it is of course misleading, it's a good life lesson to not blindly follow KM like the word of God and actually learn about the coin(s) in general.
Search the archive on here for those threads.
Note particularly that for the early 1700s up to about 1730 or so - while there are indeed a large amount of contemporary counterfeits of these years - the weights of seemingly genuine regal pieces are found to vary quite a bit lower than the 6.0 grams or so that they "should" be. It seems often they were cheating even more than they meant to cheat...
=================
As for cleaning... the Spaniards often don't know of that term (even the well-known numismatic houses). That said, ANY pics should have made it clear that this piece has been cleaned - if they didn't, you have to get better at interpolating photos.