An owner on Antique's Roadshow was left speechless at a valuation of a "great Liverpudlian invention".
Tonight's edition of the popular BBC programme featured an auction at Media City.
A guest was thrilled when she presented a set of 18th century prints to expert John Sandon.
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The owner believed her father had sourced them in Coventry where he worked as an architect after World War 2.
However, the expert informed her the pieces would usually be found to decorate a fireplace - and were actually created by artists John Sadler and Guy Green in Liverpool.
He said: "These printed tiles were a great Liverpudlian invention."
John continued: "Delft tiles had been made in Liverpool and painted in blue and white.
"But two potters discovered a method of applying transfer prints back in the 1760s. They did wonderful work because each individual tile is a wonderful work of art."
He added: "They are early examples of Sadler and Green's work but they are normally in black. That was the usual colour.
"What I like about these is the colour. They are all a wonderful red."
John explained the prints were a classic example of the old Dutch method of making tiles and valued each print at around £250 - £300 since they were in good condition.
The guest was speechless at the price as she claimed to have around 15 of the pieces.
John said: "So if you've got 15 of them, that's about £4000 - £5000.
The stunned guest responded: "My goodness me. I think I better go home and count them."
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