Fiddlethread knife-&-fork dessert set for (almost) 12

Made by Ball, Tompkins & Black, NYC, c1845 -- 12 forks, each 7" long, and 11 knives with silver blades, 8-1/4" long. Mono on all 23 pieces is M D (shown). Only the knives are marked with the makers' names. Some of the hollow handles have light dings, but, by and large, overall condition is excellent.