This is actually an obverse painted lamp, that is, painted on the outside of the shade. Sometimes customers only know to search for reverse painted lamps rather than obverse painted, hence the title. It features a winter scene with a snow covered house that repeats once and another scene with a taller building which suggests a snow covered church. The base is signed on the underside and on the cast iron loader or base weight: PLBG Co. which stands for Pittsburgh Lamp Brass and Glass Co. It is 22"H and the shade is 15" in diameter.
Pittsburgh Signed Winter Scene Painted Lamp