Air Logic Mosquito was the brainchild of Richard Spencer the designer of the Genesis rifle. Until recently Richard was the manager of Target Technics of Whalley Road, Accrington, Lancs but the shop recently closed with the demise of Webley.
As far as Im aware the only difference between the Mosquito mount and a standard o/p mount is that the Mosquito is offset slightly to one side to aid head alignment. () Not one of Richards better ideas as Im sure this would induce the dreaded cross over.
Good find with the '80.
HTH
Ian