I have a Winchester Model 1906 (std) manufactured in 1912 (based on serial number). It is missing the rear sight. It has a 3/8" dovetail for the rear sight mount as opposed to a screw mount type with screw elevator. All of the 1906's I see on the internet seem to have the screw type sight. Can anyone tell me if it is possible I have a 1906 variation with an original dovetail or has someone cut a dovetail where the screw hole was?