"Olive" coin silver sugar shell, Brinsmaid

A beautiful coin silver sugar shell, 6 & 9/16 inches long, in the "Olive" pattern, quite possibly made by William Gale of NYC. Marked "BRINSMAIDS," in rectangle. The mark is quite rubbed but I am sure it is BRINSMAIDS,. I cannot make out an apostrephe between the d and the final s , but I expect it is there. The shell is too late to be the Brinsmaid of Burlinton, VT in Kovels'. I expect it is the firm of Brinsmaid & Bros., Burlington, VT, ca. 1843-54, identified in Belden, since that is the right period and the mark looks very much like that in Belden. Engraved "HMS" in script. A very nice mid-19th century shell.