It had 2 factual distinctions when new: it was the first quadriphonic recording of the piece (maybe still the only one?), and it included the extra duet 'Pamina, wo bist du?' which was added to a revival and said to be by Mozart. (My recollection is that it's just thrown in at the end of the recording without explanation.)
Sawallisch's conducting is musicianly, respect-worthy, but not invigorating or (to my ears) dramatically lively. But then I've never been able to enjoy the much-praised Klemperer approach to the piece, so weigh accordingly. The cast is a good Munich lineup of the period, but not stellar for a permanent recording. The classic performances are Moser as the Queen and Moll as Sarastro, about as good as it gets. Walter Berry is not as fresh of voice as on his previous 2 recordings (which hurts 'Bei Maennern'

, but he finally gets to do the dialogue and complete his role, and it's an endearing portrayal. Rothenberger's Pamina is one of her less successful post-soubrette recordings; the line not even or subtle enough. Schreier's musicianship is an asset for Tamino, though I can't love the tone (at least not after hearing Simoneau, Wunderlich, and Burrows).
A mixed bag. Not a recording I've felt the need to keep (and I don't cull that many, ever).
Jon Alan Conrad Department of Music University of Delaware