From the album cover of Audio Fidelity Stereodisc AFSD 5861 ("Minstrel Time with the Dukes of Dixieland")...
"Audio Fidelity Records produced and released the world's first Stereophonic High Fidelity record (Stereodisc) in November , 1957".
I don't have that first disc (also Dukes of Dixieland) but I do have several others issued at the same time which have never been surpassed for audio quality in almost 50 years!!
Recently I picked up a reissue CD of the Dukes, and was disappointed. Not as good as the record, but I think the CD was just badly mastered. I guess I'll just have to keep the turntable in working condition.