Great question, and one that Joe Gonsowski and I talked about when we were working on that section of the Old Judge book. I had heard of a blue mount but had never seen one. It is probably out there but I don't know where. I have seen a few with a greenish tinge to them but I assumed that that shade was some type of discoloration. BTW, as I am sure you know, the red mounts are very scarce also.
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