Hi Swamperbob thanks for your reply. So could a proof be struck in error example a strong detailed double struck carolus in high grade with extra sharp details could be classed as a proof but may not intentionally have been made as a proof or officially recognised as a proof. For example the coin was struck with a newly changed die or struck with more force or twice because the first impression was not strong enough making the overall appearance of the coin extra sharp and detailed? So maybe the government did not officially class them as proofs at the time but more as an error. Then later on the 1800s proofs where officially struck and deliberately struck?I've seen example some carolus portraights with very strong details indeed and looked like proof coins but have seen no reference in the books but have been partially double struck.

















