Sorry, forgot all about this post. I have tracked down the maker, the mark was used by Armand Guion in the 1950s, possibly as early as the late 40's in into the early sixties. Guion had a retail shop in midtown NYC where he sold antique silver, there was a small 3 or 4 man workshop in the back where old pieces were restored and new sterling pieces were made. I'm told this mark represented no real individual's name and was intended to vaguely resemble that of DeMatteo, as was the silver it was stamped upon. In later years, Guion used the mark "Fara Co". - it was composed of the first initials of his immediate family.