Rare 1850s Early Antique Rooster Pressed Glass Tumbler 3-Mold Flint Glass

This is a very rare early glass tumbler that from my best research dates around the 1850s. It is a 3-mold pressed glass with a diamond or crosshatch pattern and a large rooster. When you hold the glass to the light, you can see many bubbles and imperfections. From what I was told, the glass would have been put into a mold and then the top edge would have been ground down flat. The edge is all original and has the typical ground technique that they used so much. Most likely this is what is considered flint glass. It is extremely light and fragile and almost hard to believe that it survived almost 170 years and has no cracks or chips. It is in amazing condition. There are some very fine flake chips on the top edge but this is most likely from when it was ground. It measures 4-3/8″ tall with an opening diameter of 2.25″ and bottom diameter of 1-7/8. A truly rare and early glass tumbler. This came out of a very old estate in Manheim, PA, which is in the same area as the famous Stiegel glass workshop. I have no idea who made this because I cannot find another anywhere and I have searched quite a bit. Please ask if you have any questions. Old antique vintage retro american history historic us usa united states of america collectibles memorabilia glassware kitchen drinking early american beverage chicken folk art primitive colonial founders pennsylvania bird animal child children jug juice container 1840s 1860s rare glass.