It looks right. The hoof is there and the leg is missing. Maybe examine it with a loupe/ microscope to see if the leg has been removed. This is what AI says: Key markers for a genuine 1937-D 3-Legged Buffalo nickel include a missing front leg (partially visible hoof/shoulder), a distinctive raised arc/stream under the buffalo ("urinating" appearance), die polishing marks, die rust/lumps near the neck/hind legs, and specific spacing in the "E Pluribus Unum" motto. Non AI lists 6 markers besides the leg/hoof: OBVERSE small feather - almost a 2 3/4 feather as it is not attached at the base by the head back of upper neck - is mottled or moth eaten a reverse, upside down V sticking out in front of the first hair braid below the twine lower neck die crack, with couple breaks .. almost looks like a couple of pearls necklace REVERSE arch spreading down below sheath in field Right Rear leg above hock is thinner than the left E Pluribus Unum is clearly separated from back of buffalo mintmark D size, shape and location
