"Danzig" overprints on Polish occupation stamps doesn't even make sense. After 1939 Danzig and East Prussia were reintegrated into Germany. There was no need for "Danzig" stamps.
There is a skyrocketing market for "Nazi" overprints, concentration camp overprints. The people who sell them on eBay are not real ethical folks. In fact , they can be the dregs of sellers out there. I've approached a number. Most are simply challenged cognitively I think, and have the moral compass of a hyena with a concussion.
Those stamps are counterfeit and there are hundreds of thousands around. They have been showing up recently so that is why you never seen them before. They are fantasies and are worth pennies each.
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Those stamps are counterfeit and there are hundreds of thousands around. They have been showing up recently so that is why you never seen them before. They are fantasies and are worth pennies each.