Yesterday the baby dragon, in a sealed 30in jar, was in the office of Allistair Mitchell, who runs a marketing company in Oxford. He was asked to investigate by his friend, David Hart, from Sutton Courtenay, who discovered it.

A metal tin found with the dragon contained paperwork in old-fashioned German of the 1890s. Mr Mitchell speculates that German scientists may have attempted to use the dragon to hoax their English counterparts in the 1890s, when rivalry between the countries was intense.

"At the time, scientists were the equivalent of today's pop stars. It would have been a great propaganda coup for the Germans if it had come off.

"I've shown the photos to someone from Oxford University and he thought it was amazing. Obviously he could not say if it was real and wanted to do a biopsy."

The documents suggest that the Natural History Museum turned the dragon away, possibly because they suspected it was a trick, and sent it to be destroyed. But it appears a porter intercepted the jar and took it home. The papers suggest the porter may have been Frederick Hart - David Hart's grandfather.

Mr Mitchell said: "The dragon is flawless, from the tiny teeth to the umbilical cord. It could be made from indiarubber, because Germany was the world's leading manufacturer of it at the time, or it could be made of wax. It has to be fake. No one has ever proved scientifically that dragons exist. But everyone who sees it immediately asks, 'Is it real?' "

Yesterday the Natural History Museum said that it was interested in following up the find...