From what I have read about the uniquely British phenomenon of "Cherished number plates" I'd imagine "1 AMG" would be worth a bloody fortune, so I hope you still have that plate for the car.

I read that the holder of the plate "MB 1" was offered 30,000 GBP for it, by Mercedes Benz, and HE TURNED THEM DOWN!!!

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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)