Miami - (Reuterus & Ass Mess): The Xtra-Large pink M&S stretch polyester undies were left by the Queen on a private plane to Chile circa 1968.
They are being auctioned by the estate of 'Baron' Joseph de Bicske Dobrony who paid General Pinochet $5,000 for them.
The Chilean dictator was known for 40 years of shagging Old Fatty Mountbatten and plundering intimate trophies from her person.
Dobrony's collection is now going under the hammer in Florida to help pay death duties.
It is said to consist of five of HM's Playtex Double-Cross-Your-Heart brassieres, a Grossard balconette underwired push over - er...push-up! - bra, a silk-lined crocodile skin waspie, various leatherette split crotch thongs, a rubber girdle and countless pairs of monogrammed latex stockings.
The Hungarian fetish collector bragged of having screwed Anita Eckberg, Raquel Welch, Eva Gabor, Ava Gardner, Brigitte Bardot and dozens of others starlets.
He died in June ahed 88.