I came across this full version of Tosca on youtube. It was recorded in 1928-1929.
The musicians are as follows:
Tosca: Carmen Melis
Mario Cavaradossi: Piero Pauli
Il barone Scarpia: Apollo Granforte
Angelotti, Sciarrone: Giovanni Azzimonti
Sacrestano: Antonio Gelli
Spoletta: Nello Palai
Direttore Carlo Sabajno
Orchestra e coro del Teatro alla Scala