Year of purchase unknown. It shows signs of use, but is still usable. ------Quoted from the official HP------ Butterfly glass lid, a standalone product exclusively for the Ingenio Neo series. It folds flat for compact stacking and storage. The knob is a butterfly type that folds flat, allowing for neat storage. It's made of glass, so you can easily see the contents while cooking. *Please select the size that matches the "inner diameter of the rim" of your frying pan or pot.