I would only be assuming, but my best guess would be a federally approved test from the country in which you reside. (providing the testing standards are equivalent to, or meet the requirements of, those of RSA)
Appreciate your info and feedback, I looked at some European websites to try and get info on the value of this particular Steyr. Further input from you on it's value would be appreciated as you have a bunch of them. I assume you collect the Steyr Luxus for a reason ---they are a finely built rifle.