I've handled a number of selfbows from the 1880s and forward over the years. There is evolution in style that kinda' places them in time. I agree with bowdoc on the time period and wood. The use of horn on nocks begins to leave the scene about 1940 or so. Lemonwood use continued until these bows left the scene.
The wooden pieces glued on the back of the handle is called a "grasp" and have been around for at least 150 years. They are added for comfort and not stiffening of the handle. It looks to me the grip is original but if not, it was a nice "re-do."
The carved string nock grooves look sorta crude, like maybe it had originally held horn nocks and re-done, which is not uncommon. The numbers on the back of the tip likely eliminate this thought. I cannot remember seeing one marked in this manner and at least from my experience is somewhat unusual.
All in all a nice representative piece from that period.
It would pass for my Highfield if it had horn nocks.