Good vintage condition Pre-1950s PYREX yellow primary colors nesting bowl #404, 4L. See photos for all scuffs and lines on the bowl. Sold as is. It is still so vibrant and glossy for being over 75 years old! The inside is in great condition. The whole bowl is too for the most part. There are a few flea bites scattered throughout but as you can see, there is one part with scratches that look like a constellation in the sky lol. I used Peek to polish up the bowl and it looks great. According to the backstamp - the earliest color ware round bowls included the word PYREX with the abbreviation T.M. REG. arched above it, and U.S. PAT. OFF. in a downward curve below forming a broken circle of sorts around the name. See photos for condition. Note this is a used vintage piece, sold as is.