+Spoo Posted September 5, 2005 Share Posted September 5, 2005 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? OC2706 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. Quote Link to comment
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