All I can tell you is that it appears on other pieces. WES is cited as the go to source on the maker mark..might search SMP Silver Salon Forums threads to see if he ever discussed that added mark. Casually, I would describe it as a "spearhead emenating from a crescent" and it seems to be a full mark rather than a cut off partial. Conning was known as a Confederate swordmaker, but I wouldn't jump to any conclusions about blade-shaped additional marks. Whether he is retailing a supplied piece is a whole other area to look at. He's said to be the more common of Mobile makers seen and came from New York to this other busy port city.