I can't see someone going to the trouble of cleaning one side and not the other...? Whizzing used to be the preferred method of cleaning these (have a few examples)...but there no sign of that here. Most dipped copper turns a pinkish color that's not apparent here...so I don't know about the cleaned part? My first thought was like John1 mentioned...foldered for a long time?
Not sure if sending her off for conservation will help and then graded...looks like she has potential?
conserved and gussy'd up I'm guessing MS63 may 64...just not sure it's worth it?
Let us know what you decide...
smat