I hope you are well and surviving this terrible period without too many difficulties! Many thanks for your quick answer. I have "Navi Mercantile perdute" which is essential for naval research.
According to the Diari di Guerra Marialbania Cartella 46 (USMM), Antonietta was observed to be on fire and abandoned by the torpedo-boat Antares at 0610 hours on 22 December 1940 in 40°40' N, 18°40' E. The torpedo-boat Aretusa (operating from Brindisi) was diverted to search for survivors but found nothing (the crew of six had been captured by Papanicolis).
Anyone has a photo of Antonietta? I know that photos of small vessels are hard to find!
On a similar subject, Quinto was sunk on 31.12.1940 by gunfire from the submarine Katsonis and a lifeboat was found shot to pieces. Italian intelligence had correctly identified the submarine. Was there any formal accusation of a war crime or the subject was dropped? Many thanks again.