Thank you for your reply.
I would argue that in that case it is then a “Proof coin that has been damaged and therefore selling as bullion”
But the damage doesn’t take away the fact that originally this coin was minted as a proof, marketed as a proof, and sold as a proof. (Despite NGC’s categorising proofs underneath bullion in their registry)
I would say that when a coin is damaged you could argue it is “bullion proof” but NGC doesn’t have categories for damaged coins.
If you go to any dealer and state that you are looking for a “Bullion proof” I am sure they will be puzzled and will ask you, are you looking for a bullion or a proof coin?
If you want to state that all proof coins are bullion because they contain precious metals, then we can be really pedantic and look up the definition of bullion in the Oxford English Dictionary and discover that no coins are in fact bullion under this definition, unless valued by weight.
And as you are aware there are bullion coins that have a premium added to them, e.g. a very old panda coin may sell at a substantial premium to the metal weight, despite being a “bullion” coin.
noun
noun: bullion
1.
gold or silver in bulk before coining, or valued by weight.
"gold bullion"
2.
ornamental braid or fringing made with twists of gold or silver thread.
"bullion cords”