This is a vintage Pyrex glass coffee percolator (6-cup size). It's a product from the "Flameware" series, manufactured from around 1936 to 1979, and can be used directly on a flame. Being made of glass, you can visually enjoy the process of the water boiling and the coffee brewing. Besides coffee, it can also be used as a kettle for boiling water, making barley tea, or boiling eggs. It doesn't require paper filters, making it economical, and the internal basket and other parts are made of aluminum. Brewing coffee with this is incredibly delicious, and it's easy to use because it can be used on a regular gas stove. There is a crack. See photo 5. It's a valuable item that is no longer manufactured. Coffee lovers, how about it? Thank you for looking.