1960 Portugal $5 $10 $20 Silver Coins Stamped PROVA

Ive had these in my World coin type box for a few years now and never really put much thought into them. I know the PROVA stamp signifies them as Specimens.
My question is how rare are these and how were they originally issued?
I was lucky enough to pick these from melt for myself, so have minimal investment. Not that I intend to sell them, they are so nice as a set and a great place holder as my only Portuguese coins.
My question is how rare are these and how were they originally issued?
I was lucky enough to pick these from melt for myself, so have minimal investment. Not that I intend to sell them, they are so nice as a set and a great place holder as my only Portuguese coins.
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Comments
The coins do have nice luster but is muted slightly, I could treat the surfaces with CoinCare haven't gotten around to it.
I wouldnt call the $5 matte same brilliant luster as the rest.