Who made this tightly swirled glass?

These are beautiful and fragile mouth blown with tight spiral ribbing. To me they look art deco. Although surely blown, there is no open pontil mark so I assume they were blown from the top. I have 4 of them. These are very thin depression color glass with slight differences so I'm sure they are one-of-a-kind. There are minor variations in each glass, especially around the foot and stem, being that their is a difference in the diameter of each foot and stem. Also, the foot on one is flat on the table, on yet another it is quite concave, and the other two lie somewhere in between. Any idea who might have made them? I don't see any makers marks and the do not glow. They measure 8-1/2 inches high. Thanks!