You should look further to the left. The most rare overdate here is 858/557, not 58/57, and from the differences in the 8s I actually think you just might have got that one. This is not a typical 8 for the second digit. Still, I cannot conclude anything with confidence, but I believe there is every reason to look closer in your microscope.
By the way - noone has ever (as far as I know) seen a 1557, so it is assumed to be en error that was discovered before minting.
By the way - noone has ever (as far as I know) seen a 1557, so it is assumed to be en error that was discovered before minting.





















