JAJ were the producers of PYREX bowls and bakeware in England from 1922 until the plant (in Sunderland, UK) closed in 2007. Items were back-stamped JAJ (short for James A Jobling) until the mid-1970s, which is when Corning purchased the company and items started production with the PYREX ENGLAND back-stamp.
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For more on English PYREX, consider purchasing my self-published book on all things International PYREX!
More information here: https://bit.ly/2CqkjDC
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THIS LISTING:
JAJ PYREX 'Mandarin'
Round Casseroles (set x2)
Equivalent to US models #474 and #475
Both casseroles are in great vintage condition. Pattern is bright and shiny and free from any dishwasher damage. There are a couple of light scratches in the pattern, which you can see from the pictures, but minimal. The larger casserole does have a small slither chip on the underside of the handle, as per the last picture.