A rare first day cover autographed by Barnes Wallis has gone on sale on eBay. It has been donated to the 617 Squadron Netherlands Aircrew Memorial Foundation, and the proceeds from the sale will be given to the appeal fund for a new memorial to the crew of Dams Raid aircraft AJ-A, piloted by Sqn Ldr Melvin (Dinghy) Young, which shot down at Castricum-aan-Zee on the Dutch coast on 17 May 1943. The memorial will be unveiled in 2018 to mark the 75th anniversary of the crew’s burial in the nearby Bergen cemetery.
The item was generously donated to the Fund by the collector Ray Hepner.
The cover was signed by Sir Barnes Wallis in June 1976 at his residence, White Hill House, Effingham, Surrey, and given to Ray Hepner. It is one of the First Day Covers produced to commemorate the 40th anniversary of the first flight of the Vickers Wellington bomber, designed by Wallis.
Further details can be found on the eBay site here.
The sale will close on 30 November 2017.
Dambusters Blog 
There is a very good bid on this already, a good cause will benefit, well done Ray!
Excellent lets hope a good sum is raised. Have discovered a bit about Charles Walpole Roberts according to his birth certificate he was born at North Repps near Cromer north Norfolk. His name is inscribed on the North Repps Church War memorial. Have a pic of this