There are several machines like yours in the world. It is not the first A500 to roll out of a factory, not even the factory it was made in.
You already got the answer on EAB..
Of course you could try and find all the people with a similar sticker in their A500s and perhaps see if the barcode sticker next to it is a running number or something.
But if your machine has a C= sticker instead of a molded C= logo in the case, or if it's got a power LED that dims instead of turning off when the filter is disabled, then .. it's just another rev6 A500 from the early 90s.
