The "8" on my Joseph Nadler rifle, and the "36" on my Peter Singer rifle are engraved, not stamped. Both are about 5/8" tall and are intended to be read with the rifles vertical and the butt down, as they would be standing in a rack. Although made by different makers and being a bit different in architecture, these two rifles are of the same barrel length, weight, and caliber (.45). Both are walnut halfstocks with german silver mountings. The third rifle I mentioned (by H. P. Brunker) was also quite similar in weight, caliber, etc. I saw this rifle nearly forty years ago, long before I knew about the other two. I do not recall the number, but it was the same size as the others and was also engraved into the trigger guard. I wish I could find that rifle again. And yes, the engraved numbers are quite similar in style to the "8" on Tom's horn.