Researching this tea caddy for a friend and wondering if the pseudo marks do reveal a clue to the maker or any other information:
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The London import marks reveal the sponsor as H. Landsberg & Son (Louis Landsberg) and the assay date of 1892. The only apparently (to me) genuine Dutch mark found so far is the 1892 date letter.
As I write, I'm informed that some further faint marks have been found and I'll update the topic as soon as I receive the images.
Trev.