18thC teaspoon by William B. Guthrie, Mercersburg, PA

Pointed-end handle with unusually long narrow bowl, elongated roulette drop on bowl back (see pic), feathered script mono L R on front; 5-3/4" long. Condition is near-mint -- extended tip unworn. You can find mark by Googling "American Silversmiths," then scrolling down to listings.