This one has stamped "M-1500, Surgical Steel, made in Japan." on one side of the main blade, and "Parker & Son, Chattanooga, TN." on the other.
It also has a very good walk & talk. The part that I question is the "Surgical Steel" bit. You say it might be 440C? That would be nice. As I already said, the scales appear to be real bone too.
Surgical steel can mean just about anything. In this case its probably 440A or 420.