Ooo, ooo! A question I actually have some unique knowledge about.
AFAIK, anything with a Jaguar tang stamp is a "real" Jag. I have not seen a Rostfrei knock-off of either the insert or oval-skeletonized (both "surgical steel") Jaguars.
However, the most common design for crap balis, chromed, with circular holes, also exists as a Jaguar. If anyone is interested in the differences between them (beyond "JAGUAR STAINLESS TAIWAN" and "ROSTFREI"), my posts on this forum can be searched.