Piece of Metal

[Crispin]

I found this in Oahu, Hawaii a couple of weeks ago with my coinmaster pro. I was on Waikiki Beach, outside of the Moana Surfrider and Royal Hawaiin. The waves had eroded into water line, View attachment 655375 View attachment 655374 View attachment 655376 and it was at the notch of a two foot drop...about another 18 inches down farther into it. It measures 3 by 5 inches approx. it its bent condition. It is definitely machine made. I don't know what type of metal it is but it is extremely non-pliable for the amount it has been bent. I think there is one rivet in it or something in it... Any ideas? What type of metal?
Thanks

 

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[allen_idaho]

Looks like a copper alloy, based on the coloring.