(TDB) - A man who bought what he thought was a fake 17th century wine bottle in order to stop others being conned into buying it was shocked when it proved to be genuine, making him a tidy profit of £21,470.

As reported by the Express, Steve Williams, an antique collector and Network Rail engineer, spotted the brown glass bottle at Doncaster Antiques Fair and was convinced it was a fake.

He bought the bottle for £30 and took to Facebook to let his followers know what he’d done. However, Alan Blakeman of BBR auctions in South Yorkshire spotted the picture of the bottle and asked for a closer look.

Blakeman confirmed that the bottle was indeed genuine and the bottle sold at auction over the weekend of 7-8 July for a whopping £18,000. With auction fees added on, the buyer ended up paying £21,500 meaning that Williams technically made a profit of £21,470, although presumably a proportion of the additional cost will go to the auction house.