The sight used to deliver the decisive 'bouncing bomb' on the famous Dambusters raid has sold at auction for over £40,000.
The home-made sight used to guide the legendary Barnes Wallis' invention which breached the Mohne Dam went for a whopping £41,500.
Made from mahogany, it was designed by Wing Cdr CL Dann and used by the bomb aimer Pilot Officer John Fort on the fifth Lancaster from RAF Scampton near Lincoln to attack the dam, flown by Flt Lt David Maltby.
Auctioneers JP Humbert at Towcester in Northampton had estimated the sight's value at between £20,000 and £25,000.
It was among a collection sold for a total of £75,000 in an annual International Militaria Sale after "huge global interest" in the items.
Some of the marbles that Dr Barnes Wallis used to design his bouncing bomb realised £27,200
Humberts also sold the map light and parallelogram used by Vivian Nicholson, the flight navigator, for £2,700 and £2,650 respectively.
A leather collar box once belonging to Wing Commander Guy Gibson sold for £750
Auctioneer Jonathan Humbert said: "'The overwhelming interest we have had in these items is testament to the bravery and heroism of the the men who risked their lives in Operation Chastice.
"These historical items, much like the story of the Dambusters, have really captured the imagination and I am delighted that the auction has met with such resounding success."
