There's not a lot of good news on that horn.  The serial # puts the production date some time in 1923.  The good news is that a low pitch horn is compatible with modern instruments in an ensemble.  If it were a high pitch horn, the value would be zero.  The True Tones are sweet sounding horns with a reputation for playing somewhat better than other horns from the same era, but hey don't have a high market value.   

 I suspect that that horn is neither an alto or a tenor, but a C-melody.  It looks a lot like a tenor because of the curved neck, but the location of the B key (the first key above the bell seam) strongly suggests that it is a C-melody.  To be sure, measure the length from the bottom of the bow to the neck receiver.  If it's about 25" it's a C-melody.  If it's closer to 30" it's a tenor.  C-melody saxes haven't been in favor for a number of years, but they are experiencing something of a revival as a niche market.  C-melody horns have a lower value than altos and tenors.


The big bummer with that horn is that the keywork is antiquated even by vintage horn standards.  It lacks a front F bridge key, which is a big limitation for playing at the top end of the horn.  It also has a button style G# keytouch, whch is really clunky to play.  Bueschers of that era did have a single octave key, so you've at least got that much.


The horn looks like it's in reasonably good condition, but it's a horn for fanatics only.  I honestly don't see a whole lot of value as a mainstream player's horn.  Your best option would be marketing the horn to historical horn buffs on an as-is basis.