Vintage JAJ Pyrex Kitchen Shelf #510 Casserole Dish W/Lid Excellent HTF For Sale
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On Page 159 of Dots and Diamonds Your Guide to International Pyrex,
It states
“Available in one size only, the pattern known unofficially as Kitchen Shelf has been discovered in very limited numbers. This begs to question whether this was a test piece as opposed to a limited run, however anything is possible.”