Steelite International is affiliated with Royal Doulton. I only found one cup with the willow pattern that had the Royal Doulton Steelite mark, and it came from Canada. Perhaps it was exported there more than to the US. You can search eBay with Royal Doulton Steelite and find a number of items; however, I didn't see any blue willow in my search just now. Doulton is no longer in production in England, so you will have to look in secondary sources. Good luck!
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