For those interested, I got an email back from Ricambio:
Thanks for the enquiry. This is not the first time we have been asked for these Wheels but the name 'Ricambio' means spare part in Italian, so all that says on your wheel is 'non original part'. The Wheels are probably made in Italy
by an aftermarket supplier but unfortunately they are not something we can help you with. There seem to be a lot of VW's and Mercs with the same wheels on too so they must be quite a large supplier. I would suggest looking at some
of the german car owner forums to see if anyone has traced the supplier in Italy.