2 Lancaster teaspoons by John Ewing & Wm. Haverstick
Both examples are remarkably similar -- 0val-end handles, c1790 -- shell drops on bowl backs (see pic), reverse ribs, and both with the same mono, block D over W * H. The difference in the shell drops is quite clear; the difference in the monos is very slight. Both spoons are just short of 4-1/2" in length. The Ewing mark is less well known, but is confirmed here with the addition of the Haverstick mark. (See p. 14 in Gerstell for description and pic of Ewing's IE mark.) The Haverstick spoon's bowl is a bit rough, but other than that both spoons are in excellent condition.