Based on Frank Hamilton's compilation of Callas' performance annals, apart from the Met performances in 1956 and 1958, she sang three nights of Tosca at the Teatro Carlo Felice, Genova in March 1954 and remember, there is that televised and filmed Act 2 with Tito Gobbi and Albert Lance in her Paris debut on 19 Dec 1958.
Fact checking aside, I agree that De Sabata's conducting plays a hugely important role in the 1953 EMI/UK Columbia Tosca attaining classic status and later critics' appraisal of it mostly attributes the success of the recording to the close-knit teamwork and chemistry among the conductor and the principal singers rather than just focusing on Callas alone.
