Closest thing to the first Royal Enfield still around.
Just a few days ago, Bonhams auctioned a 1904 AV motor bicycle. AV Motors of Aston Lower Grounds, Witton, Birmingham, was a short lived motorcycle factory. More precisely, they seemed to supply engines to motorize bicycles. The bike in question uses an "Eadie frame". At the time, Albert Eadie was the CEO of Royal Enfield and the frame looks characteristically similar to that of the first Royal Enfield motorcycle of 1901. It sold for 8,625 Pounds.