(Bonhams)

Now may be the time to start picking all the locked cabinets and doors in your grandmother's house.

After discovering this extremely rare 1937 Bugatti Type 57S Atalante hiding in their late relative's barn in 2007, an English family is putting the car up for sale next month, according to the BBC.

This Atalante, an exotic in its heyday and more exclusive than any modern Veyron, is only one of 17 made, unrestored with just over 26,000 miles. Expected initial bids are no less than $4.35 million.

More details and photos of this stunning car can be found on Bugatti's website and on this amateur classic car website.