This is the 2 1/2 qt or 2.5L mixing bowl by Pyrex in their Butterfly Gold pattern, also known as the 403 size. It originally would have been part of a three or four bowl set. It is the second largest size made in this pattern. Butterfly Gold was produced in the 1970s-80s. The bowl is 8 5/8" wide and 4 1/8" tall. It is in excellent condition, the only damage is a few specks of missing paint.