This is a cross-posting of a query I made on opera-l:
An Adnkronos article dated 18 June reports that 19 original acetates of recordings made by Maria Callas in Mexico City between 1950 and 1952 have surfaced. They were to be auctioned in Rome last week, where they were expected to fetch
It’s not clear to me from reading the article whether these are new (previously unknown) recordings or simply first-generation sources of known material. (The article uses the expressions dischi inediti and incisioni inedite but also says that they are acetati originali dei dischi incisi da Maria Callas… a Città del Messico, so it’s a little hard to parse.)
If you have any information on the recordings or the auction, please leave a comment or write to me by selecting the link on my about page.
Update: I’ve received private and on-list replies from opera-l, and the consensus seems to be that a small amount of this material may be new, but that most of it is probably already known.