Hi Coin Community! I need your help!

I purchased a large, metal two-dollar bill antique, and I'm searching all over the internet to find information about it. The current theory is that it was promotional art created for the unveiling of the 1928 two-dollar-bill.
If there's anyone on this forum that knows about the 1928 two-dollar-bill I'd love to hear from you. Anyone have any ideas what this could be?
