As a novice, my biggest challenge is figuring out the balance between under and over-cleaning. Upper left cleaned up a nice chocolate brown and was easily (
still took me a while) id'ed, at least I
hope so. Bottom left looks about the same after several days of cleaning, look forward to hearing your story. Bottom right has a partial hole on the
obverse. The other two are being slow to clean. So I plod along ... Mel