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Change In Color

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Today, I went looking for two Mountain top Triangulation Stations and an associated Azimuth Mark. (Found all three.....YAYYYYY!)


I have found many brass, copper and bronze marks......no known aluminum or Titanium.......but what is this disk material?




It is very black and I do not think the black is associated with age. Could it be Anodized Aluminum or a form of Black Oxide finish?


Just curious.

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