Manhattan Glass is one Depression glass pattern that many people don't recognize as true
"Depression Glass" because it doesn't fit into the usual markings. There are no flowers, etchings or fancy edges. This looks too modern to be old, but Manhattan Glass was produced by Anchor Hocking from 1938 to 1943. So this is truly "old". Clear or crystal was the most common color, but they also made pink, ruby, green and some iridescent pieces. The Manhattan pattern is made up of concentric ribs. The way you can tell if it's Manhattan is that if you rub your fingernail across the ribs it will catch on each one and you can hear a little "ting". One piece which does not have that "ting" is the Jug Pitcher it has rounded ribs. The color pieces are harder to find and more expensive to purchase.
Anchor Hocking also produced "Park Avenue" in 1987 as a deliberate look-alike for Manhatan. However Hocking did maintain the integrity of the old glass by changing the shapes and colors of the new pattern. Then again Hazel Atlas produced some pieces as did L.E. Smith. But looking around for these beauties you will find some interesting pieces to support your "glass habit".