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you have 2 pics
left site is similar too light green escher. from pics. right side is thuringian?
or they are same stone after lapping?
if they are different one right side stone should be a lot...

check Oldengaerde last pics. you will see what is missing.
Or you may not posted pics.
anyway it is very nice stone with cover or without it.

this is thuringian stone. at the moment stone is dirty when you lap you will see better condition and color of the stone.
After checking the action i should add item missing top cover.Great buy ...