Up to not so long ago,the first two letters in the plates in Germany indicated the City or State, ie, Berlin was B, Frankfurt was FR, etc.
Well, wouldn't you know it, I saw a photo in "Playboy"magazine (Hey everyone has to go the barber SOMETIME)

and they went to Furstenburg, and took a photo of a license plate they found on a Mercedes Benz, there:
FU - CK69. Actually existed.
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)