[twertsy]

Ok, so I just spoke with our Chief Scientist (PhD Physics). He says that it would be easy to tell a re-stamp with a thermal infra-red camera. Here's the process:
1. Start the engine and let it get hot
2. Turn the engine off
3. As it cools, take an image every 15-30 seconds
4. Compare the images (visually inspect them)

According to him, the old stamping will be revealed at some point during the cooling process. He says there is no way they could grind away enough of the original stamp without it being blatantly obvious.

So there you go.....
[img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]