Currently streaming online is a very good Beethoven Fidelio, with Hildegard Behrens, James King, Kurt Moll, Lucia Popp, etc conducted by Karl Boehm, Munich 1978. Complete libretto. Behrens is lovely and clear, so it's a nice tribute.
See HERE for the complete download free and under license from Opera Today.
The pic is an ad for meat extract - just the thing for a starving hubby! There was a huge vogue for opera-related ads in the late 19th century. One famous beer in the US was marketed as "Rheingold" which kind of makes sense but Fidelio and meat extract?