Many are indeed Conn stencils, and as such might make a very nice sounding/playing horn if it is in, or can be put in good playing condition for little money.
As far as monetary worth as a Collectible/Classic, they aren't worth a great deal, but that works in your favor if all you want is a "player".
What condition is it in, and how much can you get it for?
A few pictures would make positive identification very possible.
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