Circa 1937-1939: Early Variation—With the turquoise glaze being released later than the first five colors, the early variations of pieces in turquoise will prove harder to find than the other colors. It took quite a long time to find an early version of the ashtray (with the outside bottom rings rather than the GENUINE back stamp) in turquoise. Advanced collectors will appreciate these harder to find anomolies. Measures 6 9/16" w.