John O-O,
you have to remember the time at which your (very nice) gun has been made: It was only 4 years after WW II. Germany was total down. Suhl resources were no longer available (under russian control) and so Gunmaker Louis Delp has to take what he can get, good guns from Liege! And of course he refined it and so your gun was born.....
By the way, there wasn't any Royal Court any more since end of WW I. The US government itself made clear in some diplomatic notes, that Germany has only a chance for endurable truce if the emperor would resign...!
So, Louis Delp in 1945 was a "Hofbüchsenmacher" without "Hof" ;-)
Best Regards,
Gunwolf
