Well, I found this, which might be what you’re looking for.

Also, if you haven’t seen this, here he is in Moscow in ‘64 singing ‘La donna e mobile’, ‘Questo e quella’ and ‘Che gelida manina’.

Edit: I’ve had a browse on Discogs and I’m afraid I can’t find any evidence of him making recordings for any label other than Decca at the time. Well, you know what they say: ‘Impossible. Perhaps the archives are incomplete.’.