pocket knife, R P separated by stylized T(?) all in adiamond

[dmacbrown51]

Have a vintage folding pocket/fruit knife. Handle is 3 inches & blade is 3 inches. Blade is stamped sterling. Mark is elongated diamond with R at top, P at bottom, and a stylized character between (resembles a Towle T). Who is maker, please?

[fashion.fashoff]

usually such diamond-shaped makers' marks, sometimes called "pseudo hallmarks," are found on mid-19C american coin silver often from NY. i would have guessed this knife to be c. 1860 coin silver based on the mark and decoration. since it is stamped sterling, it might be a little later, c. 1870s, but i have seen a couple pieces where the sterling mark was merely added to old stock, after the use of the higher standard became widespread.

i don't have any coin silver mark references, but if possible i would turn there for your answer regarding the maker.

[Traintime]

Central letter is gothic "C" (like Canterbury) rather than "T" (like Thomae). Any new information on maker, age, etc. ?