There are three keys to help with dating most bottles: Side seams: None: bottle may be free blown, in which case it has a very uneven shape and dates before 1860. Or the bottle may have a nice even shape, but was spun in the mold to smooth out the seams; a practice common around 1900-1920.

What are the different colors of Depression glass?

Depression glass, as it came to be known, was produced in a wide range of bright colors—pink, pale blue, green, amber, and less common colors like canary, ultramarine, jadeite, delphite (opaque pale blue), cobalt blue, red, black, amethyst, monax, white (milk glass), and even fluorescent uranium glass that glows under

What is the most valuable piece of Depression glass?

Royal Lace (1934–1941) The most sought after pattern of Depression glass is arguably Royal Lace, which was made by the Hazel-Atlas Glass Company. This pattern was manufactured in green, pink, crystal, and most notably, cobalt blue.