To Buckstix
1. "L. wurzinger's Nachfolger" means "L.Wurzinger's successor"
2. Simply google "L.Wurzinger" and you will get 7 hits of L.Wurzinger guns/rifles
The most spectacular in James D. Julia spring 2011 auction ( now Morphy) sold for 9775 $.
In one of these is also the script "L.Wurzinger in Wien", so Franz Porizka took over some time his Viennese shop.
The Wurzinger guns/rifles date 1867 to 1875.
3. Check for the calibres in these hits, possibly one of these is also yours.
The Austrian gurus I knew on these old calibres are all gone.
Cheers
F.N.