HMS Graph (U570) Original Blueprint
 

Hi, I seem to have an HMS Graph [ Built 1941 ex German U570 ] Original Blueprint, does anyone know if this is worth something? Looks pretty old and delicate, but all readable.

Well, if it is an original blueprint of a U-boat, you can give it to me! :03:
On a serious side, You can go to a museum/historical society to see what kind of monetary value that can have. Many times an historical institute can give a good copy of the matter to the owner and retain the original for safe keeping, with the proper origin acknowledged.