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Hi Chris
I'm no legal expert, but I think if you use the word 'probably' and put in a question mark it would be hard to criticise you for having a 'deliberately misleading description'. But as for how much you might get....I sold a similar one to yours last year for around £15.00, I recall, yet a 3 flower in a pot Czech weight I sold last week made the princely sum of £1.25 (and that is before eBay and Paypal fees were deducted...it would have been simpler to give it to the local charity shop!)
Alan