I'm confident is it Johann Missillieur and he relocated to Praze in 1834 so it would date from 1830 - 1834. Looks to be Baroque and is that el Diablo on the trigger guard bow? Nice Bohemian accents - let's see el Diablo & ladies with fruit basket.

http://www.littlegun.info/arme%20autrichienne/ancien%20artisan/a%20missilieur%20johann%20gb.htm

Being from Lyon, that would explain the Missillieur á Vienne - almost all others would be in Wien.

Kind Regards,

Raimey
rse