His European license should cover him, my US license covered me while in Europe, I drove all over Germany, cars and bikes, I even got pulled over for a burned out headlight on a car on the Autobahn (1 of 4 bulbs was out) with no problem.
I think I heard someone say when he came to the uS, he had a visa which included driving motorcycle and never either realized or knew he needed a current motorcycle license. :-\
He has driven them for years, so until this mishap, he was pretty wreck free or so it seems. Not an easy task on a motorcycle when you're a high-charged action figure. :)
---His European license should cover him---
From 1968?