How do I find out about the value of a porcelain lamp made by Artistic Lamp Mfg Co New York City in the late 1930's or early 1940's?

I have a lamp artistic lamp mfg ,nyc ,it is a beige color with 4 clusters of roses on it all around the lamp front ,back amn sides ,the cluster on the sides are smaller an not as big as the front an back ones roses are pink ,has a goldest base an the org. wire am plug an it works ,thank u