You need a store, or to be a Power Seller, or to be registered as a business to do a variant listing, and it's not available in all categories - pretty sure it's not available in collectibles, stamps or coin categories. Without a store, a variant listing will incure an insertion fee per item available, too. (With a store, a listing containing 100 items, no matter what the price, will cost 20c. Without a store, if you make 100 items available in a listing at say $10 each, the insertion fee for the one listing would be $50 - and the duration is 10 days max, whereas the 20c fee with a store is for up to 30 days).
In general, the variant listing format is for the same item that has variations like colour or size (eg the same t-shirt by the same brand, available in different sizes and colours, or the same sheet set in different sizes). There are other things that are fundamentally the same that can not use a variant listing - eg CDs by different artists, or different book titles by the same author.
The round 50c coin would, as far as I know, qualify for a variant listing, but different stamps would not.
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