I have the exact same model series one Aristocrat in silver plate with the art deco engraving (mine's 292,xxx). It looks exactly like the photos you posted. These are great horns. Beautiful tone quality, great intonation, with a focused powerful sound.
Just a fyi, but the bell is not small; it just has a small amount of flare on the end of the bell that makes the bell look smaller than usual (an optical illusion of sorts).
I'm not sure about current pricing, but I'd say they are undervalued on the market meaning you should be able to get a good deal assuming you want it for playing (not flipping). At a guess, I'd say around $2k if in good playing condition but that's only a ballpark figure. In terms of 'true' value (not necessarily market value) it's worth more than that. And I think the silver plate adds value; really solid plating in those days that will last 'forever.'