Even though this beautiful, light purple Western Glass Manufacturing bottle has a screw top, this was NOT machine made, and, according to my old friend Mike Miller, this style was difficult and required a lot of skill to produce. I believe it was expertly tumbled by Mike at one time and has the classic belt buckle trademark of W.G.M. on the base. A much scarcer style to find than your everyday cork stopper job for $20 plus shipping.