Bronze was not listed for '72, it's really a '71 color, but that doesn't mean the car couldn't have been first registered in '72.
Here's a link to one for sale in AZ, reputed to be original color. I have seen photos of the engine hatch cover removed on this car and it is that color throughout.
http://phoenix.craigslist.org/evl/cto/2806023844.html
Julian
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