The Conn General Catalog 'C' - no date but probably 1925 - shows a horn with a similar wrap and detachable bell, model number 48J, called the 'New Wonder Phonograph Model Bass'. However, this horn is in CC. Apparently made originally for August Helleberg. I don't know if the BBb model number for this would be different or not. Typically (e.g. with the Orchestra Grand Bass 34J was in BBb and 36J was in CC) Conn used different numbers for BBb and CC basses. If the same numbering was followed, this bass might be a 46J. On the other hand Conn often reused numbers. The same catalog C lists the BBb Symphony Basses as 80J-83J (variants 3 or 4 valves, low or high pitch) and the CC versions as 84J-87J. Notes that are available either with a fixed bell or 'wonderphone' forward bell.
Some of the Conn catalogs had the dimension of the horns. From the catalogs available, does anyone have dimensions for the 48J?
These two horns look a lot alike with the smaller bells:

From a description from the Conn Loyalist webpage:
What Conn said in 1926:
The CC Phonograph Model Bass as shown on this page was originally built by C.G. Conn, Ltd., at the personal request of the celebrated Tuba artist, August Helleberg. Since it was introduced the bass players of New York, Philadelphia and Chicago have found the Conn Phonograph Model indispensable for their recording. Each purchaser of one of these has been unusually high in his praise of the easy tone production, quick speaking quality abd clean recordings of the Conn Phonograph Bass.
This instrument is built one tone higher than the regular BBb bass, is of smaller bore, and is made up much more compactly than the regular BBb bass used in bands. The adjustable bell enables the performer to throw the tone in any direction desired, and the curve in the bell has a marked tendency to mellow the tone. Both of these features are extremely valuable for recording purposes.
Since my horn is much smaller than other Conn's, the bolded statement from above is what has sparked my interest in the 48J family. Does anyone have a 4xJ series horn???
Tim
