How do I get a mileage badge and can I get it if I'm not the original owner?

The '84 300D turbo I bought just for kicks is starting to grow on me and it's headed for half a million miles. Only 370,800 now, but that sucker seems intent on running forever!

Fred Burgess

'84 300D turbo @ 371,000
'99 BMW R1100RT
Assorted VW's
'57 Frauline