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Basic EU principle : All metals are carrying VAT as they are used in Industry etc. (makes sense)
First exception is gold as it is mainly used as investment (tax free gold coins and gold bars are the result) or jewelry (taxed in the shop) ; After that exception - due to complainst - silver coins were also exempt albeit not for the premium on top of the spot price. Bars are not exempt but coin-bars are. Coin bars are therefore some 20% cheaper than standard silver bars.

Thanks for the explanation @goldrooster. I used to trade with a lot of EU and UK stackers a few years ago, it explains to me why they were more interested in Coins and Coin Bars and not so much in higher ounce bars.