Where to start? First, replicas are made of fiberglass. There are countless other ways to tell, however they depend on the manufacturer. Some companies are almost spot on such as the newer Intermeccanica which are almost EXACT except again, fiberglass. Other pan-based replicas depending on the details such as badging, interior, wheels, etc... the list goes on. To me one of the tell tale signs are the interiors. The VW pan based models "taper in" at the pedal cluster where as originals are more square. Also the tunnel that runs along the center of the floor is much higher in VW pans where the originals are lower and don't have an emergency brake between the seats. All that said, replicas are said to be "better" cars than the originals as far as reliability, performance and maint. I much prefer my replica over an original because I can drive it everyday and really not worry about it. And the body won't ever rust out! Nothing against the originals but my replica gives me a ton of no worry enjoyment. Mickey