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Is it possible to buy 20 x 1/20 oz. pieces for the premium of a full 1 oz. piece?
Anything is possible. As to how likely it is... not very, IMHO. Every time I see the 1/10th and 1/20th oz. gold or platinum coins for sale, there is quite a hefty premium attached to them. If you want $2000+ an oz. gold, just buy it 1/10th of an oz. at a time and you are there! :-/