ANTIQUE Weaver Scope Model 3-30 -(not 330)--this was first scope made by Weaver in El Paso TX (or possibly just before move to TX), and is mounted by three screws- one each side of rifle receiver- and the springs loop over the two screws and hold scope to receiver- a third screw held front leg to barrel (not sure if this front screw is orig as photos of this scope hard to find) . no markings on scope and one mount leg has number 2.