Hi, for sale I have a few ESB RF tops. These consist of a black cast housing, a hand and machine cut perspex block (made from two pieces as the screen used piece) with the correct three holes drilled into it and a polaroid viewfinder piece. This part is made of two sections, the frame is cast but the clear magnifying lens part is now a found plastic part that fits perfectly, this part will not yellow with age and is perfectly clear. The perspex lens block has a 0.5mm tin plate glued to the underside and is held in the housing with 4 strong magnets. Price is £55.00 (GBP) shipped. Please PM if you would like one. Thanks.