cover 3c Green (158), fine stamp, tied by bold blue 'Penna. R. R. Co., Northumberland, Pa. Aug 4 1875' oval pmk. on 'P. & E.' partly printed envelope, with original contents - a personal letter written on Penn. R. R. printed form, very fine, similar cover and marking illustrated in Brookman, which he described as 'a beautiful fancy railroad cancellation'