Most of the Maxicar hubs had campagnolo QR's..



Here is closeup detail of one of the hubs.



Here is another detail showing the "max-car" label.  Most of these bikes were depicted in the front window of the Alex Singer shop.



Here is a third hub.  I think this one might be from the



Here is another hub, again from a bicycle in the front window of the shop (I think the black beauty).



You don't always have to use a Campagnolo QR with a Maxicar hub.