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What’s the strangest thing you have ever seen at auction? I was asked the other day. A good question, but difficult to answer after several decades in the job.

Thinking back, though, several items stand out – not necessarily ones that passed through my hands, but nevertheless memorable.

The New Patent Exploding Trench was one. A Great War toy produced briefly by Britains, it involved a wooden and fabric trench loaded with six lead riflemen of the Gloucestershire Regiment. When hit, a specially placed flagstaff set off a cap, which made a loud report, shaking the trench and “killing” the soldiers. Why a British factory should have put British soldiers rather than the enemy in the trench is anyone’s guess, but it was a marketing disaster, and the toy was soon withdrawn. The result? A rare collectable that has made a decent four-figure sum in the two or three times it has appeared at auction over the past 20 years.

Perhaps the most chilling thing I have seen was not at auction but at a restoration firm. What looked like a framed piece of parchment turned out to be a collection of tattoos cut from the bodies of French soldiers in the field of Waterloo. Now who would want to buy that?

Almost as chilling – and certainly intriguing – is the Fiji Mermaid. This has its origins among Japanese fishermen, who sewed parts of different animals together to create chimera – in this case the head and arms of a monkey sewn to the body and tail of a fish.

They first came to Western notice after the captain of an American ship, thinking it a real creature, bought one from Japanese sailors in the early 19th century for thousands of dollars. The great American showman PT Barnum displayed it as a curiosity in the 1840s.

As a trip to Wikipedia will attest, Barnum understood how to generate publicity, writing to the newspapers under various pseudonyms on the subject of the Fiji Mermaid and creating a ruse whereby his associate booked into a Philadelphia hotel, secretly showing the creature to the manager, who then insisted on spreading the word and staging a display to a select audience, including journalists.

Probably destroyed in a fire around 20 years later, by then the legend had caught on and many copies were made. Look it up on Google images and see one for yourself.

Each example is usually named after the town in whose museum it now rests.