I just checked Ellen Hill's book on Mulberry Ironstone. The information she gives including photos of the pattern are makers:
Gildea & Walker -- c. 1881
TJ & J Mayer -- c. 1855 and
Rorstrand, Sweden -- c. 1860
I have sent Ellen an email asking her to look in on the Message Board and give you a little more help in how you might go about finding some more pieces in your pattern.
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