Arnie,
Sounds like you're chasing down another interesting firearm story. I did a little digging through online references. I found an Antonia Genella (b. abt. 1819 in Switzerland) living in Warren County, Vicksburg, MS in the federal census records for 1850, 1860 and 1870. He was evidently a prominant merchant in the area. In the 1860 census his real estate value was given at $40,000 and his personal estate was valued at $100,000. In that year he gave his occupation as "China Merchant". I found a reference to Antonia Genella on page 48 of a book entitled Twenty-Seventh Louisiana Volunteer Infantry by Terry G. Scriber (published by Pelican Publishing 2006) that stated, "Antonia Genella, a native of Switzerland, arrived (in Vicksburg) and opened a variety store that also dealt in pistols and long arms." Antonia Genella died on June 12, 1871 in Vicksburg. He was buried in Cedar Hill Cemetery next to his wife. He was married to Louisa Harris Genella, born Nov. 11, 1825 in Petersburg City, VA, and died Aug. 31, 1865 in Vicksburg. The one book referenced here was the only indicator I could come up with that associated this individual with firearm dealings. No indicator that he ever made guns himself. I'll see if I can dig up anything more.
Mark