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When something is aesthetically appealing, beautifully made or intrinsically valuable, it is easy to see why bidders will compete for it at auction.

Rarities, too, command attention, and for the rarest even poor condition can be no barrier to an impressive hammer price.

But some people like oddities, even the macabre, and I have come across quite a few in my long career at the rostrum.

Take, for example, The New Patent Exploding Trench. A WW1 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rather than the enemy in the trench is anyone’s guess, but it was a marketing disaster as a result and the toy was soon withdrawn. The result? A rare collectable that has made a decent four-figure sum in the three or four times it has appeared at auction over the past 30 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?

Perhaps the most disturbing item I have come across is a 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.