I agree with Joe, they appear to have been stored somewhere and exposed to dampness or mildew. It's my opinion that a horde of these stored together was found at some point as the mildew and discoloration appear to be the same on many examples. Just my opinion.
Hard to say Sven. I know that Paul has one, Kevin has one, Ruptured Duck has one, and I've seen another for sale a long time ago. No way of telling for sure, but I think a nice conditioned one without the bluish green patina would be hard to find.
Thank you very much. This one at Ruptured Duck looks a little bid burned at the top. I was thinking about buying this item but the condition is really bad. I'm not sure if I shall do it. In nice condition I only saw Tilsit triangles without the bar.
Darin is correct, I have one too.
I think I got mine from the Collector's Guild several years ago.
I never thought mine was burned, I thought it just had storage damage.
Here are a few photos.
It's in pretty good shape, so the "greening" traditions bar never really bothered me.