Hi Byron,
The distinguishing shape of your lamp's envelope, the abnormally narrow neck where it exits the base, and the "Y" shaped stem supporting the filament are all features often attributed to lamps made by Mather-Perkins. This assumption is made by many collectors, but I don't have any old literature to prove or disprove this. I believe that you are correct about the lamp's age. It's a nice early lamp and a great find!