These 2 9's have big problems. Errors on each one. Looks to me to be the same engraver on these too. The left one has the backward 9 in the 1893.the right one forgot the 2 in between the MAY and the 1893.Also the N is backwards on the front on the ING in HEMINGRAY. When looking at the similar engravings, the PATENT on both of these is much larger then the rest of the lettering. the 9 on the right is giant sized. This is why I assume it was the same engraver. What do you think???