I have this water mark on the back of A11 15k Brown/vio/bluIt is all dark diamonds do not alternate from white to dark any ideas? and this watermark is not listed in Scott for Russia.and this diamond covers the entire stamp.
My mistake, I should have quoted it straight away. I meant a few lines higher: "Vertical lozenges of varnish on face". I suppose that is what you have, as the pattern you have drawn looks just like it and your stamp also exists with this feature.
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