The only three that I can find that used the H&G mark are Heath & Greatbatch,,Holland & Green, and Hollinshead & Griffiths !! The registry mark indicates the design was registered in class IV, ceramics,,on November the 18th,,1872 !! So that gives you an idea of when it was made !! I have not found another in that pattern !!
Thanks for your efforts, Martha! I can’t find any in this pattern either. It’s really pretty. Doesn’t come through well in the photos, but there is quite a bit of iridescent silver paint used. I have two large dinner plates in this design.