Where is the serial number on a AEG microwave?

The data plate is on the rear of the microwave. For built-in models it may need to be slid out to read it.

Where the rating plate is1
  1. On the back panel

Source: AEG UK – Where can I find appliance's PNC number?

How old is my AEG microwave?

Copy the serial number from the plate, or paste everything on it.

AEG

All AEG appliances