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how would they make a 3-d coin
The "3-D" segment is struck separately, like a little badge or fridge magnet; there's a little slot in the coin itself to jam the badge into, to keep it upright. The "
Brandenburg Gate coin" in the same series has eight little holes drilled into it, in which the pillars of the gate-segment slot into.
These "coins" should come with a warning: "Some assembly required".

Many of these Nauru pseudo-coins have German themes, so it wouldn't surprise me if the mint responsible for them was found to be in Germany.
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But, this thread was purely to look at an unusual coin, not to get into the issuing authority.
Unfortunately, "issuing authority" cuts right to the heart of whether the object is truly classifiable as a "coin" or not. It's easy for a private mint to make wacky coin designs if you don't need to persuade a government to declare them legal tender. Most coin collectors don't want medals, or tokens, or badges, or other non-coin-things in their coin collection, and "legal tender status" from the "legitimate government" of a "recognized country" is crucial for fitting the definition of "coin".
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Why is the weekend nearly over :(
Sorry, but altering the temporal matrix of the universe is beyond my powers as a moderator.

And speaking of moderator powers...
Yes, the forum is automatically editing everybody's ebay links to redirect them to ebay USA. Inconvenient for Australians and in cases like this, we realize, but this forum gets an advertising benefit from ebay only if the links are redirected via ebay USA. If you want to see these coins as they appear on German ebay, click on the "View the original listing" link on the page that comes up.
And since this thread is not about Australian coins, I'll be moving it to the World Coins section shortly.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis