Argentina Cordoba 2 Reales Piece 1844

If the color of photograph is showing on my monitor correct?
Then I would guess 75% with the silver having migrated to surface , then wore down revealing more of the copper alloy?
nice coin!

I've never heard that interpretation of the "9 Ds" expression. My understanding is that it means "9 decimos", or 9 parts out of 10 for metal content. I was looking through my other Argentina coins and found this gold piece, which has the expression "9 Dos Fino" on the obverse. I know this piece has the same 90% gold content as a USA 5-dollar gold piece so in this case the expression does correspond to an alloy with 90% precious metal content.

Anyone else have an opinion about actual silver content of this coin, or input on grade?

Very interesting 2 reales 1844 minted in my city of Cordoba mint, (it was at 5 squares from my office) they are scarce coins to find and valuable also in that condition, yet ist one of the most common year and tipe. They were minted for local market transaction, so its debased, and the silver content can be variable from 70% to 75% silver, rest in cooper. Your coin was used in fourniture or jewerly, how was custom here after demonetized. Was minted during our civil war, that because the "confederada" for supply the lack of local market currency using the silver mines of the province (now some of them are into my farmland). Cordoba coins are always crudely minted, are always in high local demmand by our small colllectors market who can pay around 100 u$d for your coin also in that condition.