If I recall correctly, the "SA" in the "OSA" prefix meant "Stereo Album" and the second digit in the album number indicated the number of discs in the set so you are correct, all of the OSA-1100 sets should have been single discs in a box. The "O" in the prefix must have meant "Operatic" since any non-operatic sets I have, such as Solti's Mahler Symphonies are prefixed "CSA".
> From: Richard A. Kaplan <[log in to unmask]>
>To: [log in to unmask]
>Sent: Friday, April 26, 2013 4:20:41 PM
>Subject: Re: [ARSCLIST] Single LP box sets
>And, let's not forget the single-disc operatic/vocal boxes on London
>Records: Ansermet's Martyre de Ste. Sebastien (LL-1061 and OSA-1104) and
>L'Enfant et les Sortileges (XLL-1180 and SR-33086) and Kertesz's Bluebeard's
>Castle (OSA-1158). Probably the Puccini "Trilogy" operas as well. For that
>matter, I would guess that the entire OSA-1100 series was in boxes.
>In a message dated 4/26/2013 1:51:12 P.M. Central Daylight Time,
>[log in to unmask] writes:
>Yes, but the RCA Victor first recording of Amahl (LM-1701) came with a
>text booklet. Thus the box for the single record.
>Similar RCA Victor single LPs in boxes with enclosed printed texts
>included LCT-1033 (Die Walkure Act I -- Lehmann, Melchior, Bruno Walter etc.);
>LM-1217 (Treasury of Harpsichord Music -- Landowska, later repackaged in a
>single standard cardboard sleeve with booklet); LM-1802 ("An Adventure in High
>Fidelity"); LM-1849 (Verdi: Te Deum, Boito: Mefistofele Prologue --
>Toscanini); LM-1862 (Romberg: "Deep in My Heart, Dear" -- Romberg, cond.); and
>LM-1944 (Busoni: Arlecchino -- Glyndebourne Festival). So was LHMV-1007
>(Purcell: Dido and Aeneas -- Flagstad et. al.). There were also the entire
>issued titles in LHMV-1 through -32, single LPs in boxes with text inserts and,
>in many cases, art reproductions.
>Also, the single Capitol LPs issued in boxes contained text booklets. That
>included "The Orchestra" and other Stokowski titles.
>The point of the original inquiry about this, if I recall correctly,
>concerned the Telefunken, Ducretet-Thomson, London International etc. LPs issued
>in the USA in single boxes that contained nothing but the record in its
>regular heavy paper sleeve. No printed texts.
>From: DAVID BURNHAM <[log in to unmask]>
>To: ARSCLIST <[log in to unmask]>
>Sent: Fri, Apr 26, 2013 3:15 am
>Subject: [ARSCLIST] Single LP box sets
>I just came across another recording that falls into this category which
>sending only because there were no RCA Victor LPs in my list I sent
>Menotti's "Amahl and the Night Visitors" was released on RCA in a box with