1954 S mint mark error possible S/D

So I found this today looking through my 50s wheat backs. Tell me what you think, thanks!

This is a very well known cracked die. It is not a D mint mark.

Nice find, after all these years. Bob got it quick, I was still looking.
James

It might not be an S/D, but it is an S/S...RPM#2. Either Stage J or K.