Hundreds of rare gold coins found in the walls of a remote French mansion go under the hammer this month, the auction house tasked with selling the treasure said on Thursday.

The 239 coins, minted before the French Revolution during the reigns of Louis XIII and Louis XIV, were discovered when the owners of the mansion near Quimper in the western Brittany region hired stonemasons to unite the three buildings of their property, auctioneers Ivoire said.

During the work, three craftspeople found a metal box filled with gold coins in a wall.

"The box was embedded in the wall, stuck between stones," the mansion's owner, Francois Mion, told AFP.

A few days later, they found more coins in a pouch hidden above a wooden beam, he said.

The 2019 find was only reported now after the owners tasked the auction house with selling the treasure.

The proceeds, estimated at 250,000 to 300,000 euros ($296,000-$355,000), will be divided between them and the craftspeople who found the coins.

The coins include several Louis d'Or and double Louis d'Or, including a very rare coin depicting Louis XIV dating back to 1646 -- it alone is valued at about 15,000 euros.

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