emanuil.hv What's the little W and 9 about? First time I see this.
This is an interchangeable plate issued to two vehicles at once.There is a good explanation on wikipedia:
Two vehicles of the same class (two cars, two motorbikes or light vehicles, two trailers) may be registered with an alternating licence plate. In this case, only the last digit varies – e.g. B-KJ 414|5 and B-KJ 414|6 – and is printed on an extra plate which remains on either vehicle, whereas the main part of the plate has to be attached to the vehicle in use. The main part carries the registration seal and a small letter W for Wechselkennzeichen, the individual part carries the technical inspection seal and below, in very small letters, the associated main number. Both vehicles have to pay full tax, yet the insurance premium may be discounted.[42]