Lietz c1 scope
Your friend is probably referring to the scope used on the FN C1 A1 Canadian Forces issue FAL it is a very rare and expensive item and when complete with the carrying case ( can) scope caps body cover mount, screw driver and mount protector will fetch prices in the $1200 or more catagory. There is one available at The Calgary Shooting Center @ $1800. They were used on the C1 but I had seen them in the 70's mounted on C2's for competition. Photos can be seen in Collector Grade publications book by Blake Stevens called The North American FAL. g2.