This example appears to have a genuine lens cap but it is not chrome plated as usually seen.  Rather, it appears to be black anodized with white lettering.

  

 

 

 

 

 

 

 

 

 

Having put a lot of miles on my Ducati motorcycle on the winding road between San Francisco and Mendocino, I can only wonder who originally proposed during some business meeting of the Ducati brothers back in the early 1950's "Why don't we stop making cameras and start making motorcycles?" - complimenti, a brilliant idea.