Antique 3-quart casserole dish is marked 026-626B, and is 11.75" in diameter (including scalloped tab handles), 9.75" interior diameter, and 3" deep. Backstamp contains "T.M. REG." above the word "PYREX" and "U.S. PAT. OFF." below, enclosed in a circle. In good used condition, with some "straw marks" on bottom and 5 fleabites on rim; stored many years in a smoke-free home.