This Blue Delphite refrigerator dish from Pyrex is the 502 model with the number and Pyrex pressed in to the lid and Pyrex Made in Canada on the bottom of the dish.
In nearly pristine condition with no scratches inside or out, no chips except for some very minor ones out of the seam lines around the edge in some spots, and very smooth and shiny inside and out with no sign of ever having been put through a dishwasher
This is the rectangular #502 fridge dish