...on purpose.
The email:
Dear Sir/Madam,
Can I interest you in this iron cannon?, It's 18th century and French, cast with bands of stylised lotus, the barrel inscribed Gavre au Ghapet, Master-General of Ordnance's cypher and it's 101cm long overall, looks like it has a later carriage. It's in beautiful condition and i can provide more pictures if you are interested. I'd be looking in the region of £5000 for it. I have included a picture.
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The photo: