Ok, encouraging news about the numbers!
BTW, now we can all see " S, S & S Suhl" on the lockplate. Insider knowledge reveals that S, S & S stands for
Spangenberg, Sauer & Sturm, Suhl
- the same syndicate of manufacturers that made my "Pickelgewehr":
https://www.milsurps.com/showthread.php?t=49231
If you go here:
http://www.deutsche-biographie.de/sfz122979.html
from which I have taken these quotes:
"...mündete 1839 auf Initiative Ferdinands (1802–66) in die Gründung der „Königl. Gewehrfabrik Spangenberg & Sauer...“, die jedoch hauptsächlich von der Familie Sauer geleitet wurde.
"...1849 rüstete das einzige damals lieferfähige Suhler Konsortium, dem auch die um einen dritten Teilhaber erweiterte Firma „Spangenberg, Sauer & Sturm“ angehörte..."
Thus one can see that a lockplate marked S,S, & S must have been made post-1849
http://www.deutsches-jagd-lexikon.de...Sauer_%26_Sohn
The gun may have been one of the first S,S & S products. But it cannot have been made in 1831, 8 years before the company existed.
It now looks as if you have a more-or less intact S,S & S musket from post 1849, with a cut-down barrel, that has been fitted up with a replacement stock and a buttplate from a different gun entirely.
Maybe not Ali Bubba, but I still think it's a home-brew arrangement.