Les Contes d’Hoffmann (1971 or 1972 studio cast)

Per the German Wikipedia, this release (originally in 1972) is a version of Offenbach's opera known as the "Guiraud version," created by Ernest Guiraud.
This release was also using the "alternate order" (Prologue-Olympia-Giulietta-Antonia-Epilogue), although only the three middle acts were numbered.

Cast

Hoffmann: Placido Domingo
La Muse, Nicklause: Huguette Tourangeau
Olympia, Giulietta, Antonia, Stella: Joan Sutherland
Lindorf, Coppélius, Daptertutto, Dr. Miracle: Gabriel Bacquier
Spalanzini: Jacques Charon
Schlemil: André Neury
Crespel: Paul Plishka
La voix: Margarita Lilowa
Andrès, Cochenille, Pitichinaccio, Frantz: Hugues Cuénod
Luther: Roland Jacques
Hermann (étudiant): Paul Guigue
Nathanaël (étudiant): Pedro di Proenza
Un laquais: Jean Valaisan

There is some confusion regarding when this was recorded.
The old Decca Classics CD release (417 363-2) has no date listed for the recording anywhere in the packaging.
Wikipedia and CLOR both state this was recorded in 1971, but both claims are unsourced.
Presto lists a recording date of 1971-08-19, but it is implausible that a studio recording such as this should be recorded in the space of one day. The same Presto gives 1972-06 for the Highlights version.
Maybe sourced from this an annotation on a MusicBrainz release also states this was recorded in June 1972, but, while plausible, this is unsourced and unverified.