Here's an ebay listing for a first-gen Dura Ace crank anodized gold. Likely for BMX as others say. I've seen a few first-gen Dura Ace cranks in gold, but never paid much attention to the rest of the group.
https://www.ebay.com/itm/old-School-...e/353156190174
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.