Pyrex Yellow Refrigerator / Casserole Dish

Here is a rectangular yellow refrigerator or casserole dish that was made by the pyrex company circa the 1950's-60's.This Casserole dish measures 9 1/2" long x 6 7/8" wide and is 2 5/8" tall.This dish is marked pyrex 503-B.The condition is very good.