The 2010 Royal Enfield Classic C5 Bullet is a retro bike more accurately described as "vintage evolution." If you had purchased a Bullet ten years ago, you would have found it to be a nearly exact copy of a 1956 bullet; same soft aluminum cases and timing covers, same points-style ignition, same motor, and same manufacturing methods from five decades ago. That's changed over the last few years, after tough emissions standards prompted Royal Enfield to design a completely new unit construction engine, complete with electronic fuel injection and a catalytic converter.
It also has hydraulic lifters and a front disc brake and still manages to look even older than my '01!