You might want to submit a picture of your powder horn to an auction house like Christies or Sothebys. The last of those markings is puzzling to me. Learning to recognize these marks will help you to find treasures too, maybe even in your own home. I don't know what those other numbers are. Foreign mark on London hallmark, importer Gustave Guilaudet.
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LONDON DATE LETTERS CHART / SILVER HALLMARKS UK
I can't find any maker's marks to match your description. You will have to copy and paste it into your browser. Can I send you the writer of this article pictures of the marks? Has anyone any ideas??? Prior tothe date marks weren't letters, but look more like runes of some sort. The sovereign's head, or lack thereof, will narrow the date range.