I remember seeing a Volvo, approximately a 740/760, when I used to live in California. It had a US plate over a British or Swedish plate.
This means not much. Often European immigrants or expats put plates from the their home country under the American plates. Also owners of re-imported cars do so, or just freaks for European cars. There is even an US-company, which offeres all kind of faked European plates.
This is a really interesting topic. In my plate-collectors-forum we also have a well-filled "far away from home"-thread. We have the agreement for this thread to put there cars from other continents, and European cars only from "exotic" places, for example Transnistria, Spitzbergen, Ceuta or far Russian districts.
There are a plenty of photos of US- or Canadian cars (of tourists, not of military servicemen), several from Northern Africa an Near East.
The most outstanding sights from Germany, I remember right now, was a late 1920ies Rolls Royce from Australia, a South Korean Camper, a South Korean motorbike on the way around the world and a truck from Vladiwostok.
When I'm travelling, I also have a look on these sights and try to make pics.
This selfmade Camper I've seen 2012 in the Okanagan valley, B.C./Canada:
These two motorbikes at the Columbia Icefield:
In 2014 at the Zion N.P./Utah:
In 2014 in San Francisco (Fisherman's Wharf Hostel)
I just cannot find the pics of these sights:
- a little Camper-van (on Suzuki Carry-base IIRC), driven by an old couple (approx. generation 80+), spotted on the Edinburgh-bypass - from Australia
- a Motorhome and a Mercedes G-Klasse with invalid German plates in Swakopmund/Namibia.