Crikey. Some other people out there place a massively higher value on that razor than I would. Is it supposed to be a crocodile or alligator on the scales? Looks like a very cylindrical lizard and the kangaroo on the blade looks like a child's drawing of a tyrannosaurus rex or a bipedal rat.
Looks more like a mammal-like reptile from the Permian. Might be a cousin of Dimetrodon.
More than likely it is a well known lizard of some sort. lol