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Very cool. Was it common? I can't see it being very durable :)
I've seen a few bits and bobs that were copper plated instead of chrome. I saw these Constrictor toeclips on Ebay a while back. I've got one normal nos one and one that was a bit rusted that I've stripped and am slowly trying to polish - I may get them copper plated or just the rusted one re-chromed. Hardly dare use them after all that. [Needless to say I should have just done what @BigBlock recommended initially and de-rusted and polished the rusty one as it was.]
I had a copper plated bike in the 70's :).