The 1954 6d is nice, but the obverse is obviously a later die state of a business strike. 1954 proofs are very rare/valuable. Also, the San Francisco mint did not strike proofs of wartime Aussie coinage.
The surfaces look "different," but no, doubt those are proofs. Nice coins, though. I have the 1943-S, but minus the rough surface and polish lines.
Nothing there tells me that I am looking at "polished dies," which usually is how "proof" coins are made.
The coin was struck in San Francisco--no proofs were made of wartime issue Aussie coins. As for what caused all those lines, I think a close inspection would be the only way to find out...
Worked over because it was deteriorating. The SF Mint just had the contract on these. They were economy-class, business strikes, not proofs. Australia was right in the middle of the fighting. She had neither the time nor the inclination to be collecting proofs.