Originally Posted by JReade

Not to discount your idea, as we have all seen some backyard work that is downright scary, but this seems a little too polished.

Maybe it was a "fitting" stem that would be provided to a 3t retailer to help sell the handlebars? You swap in and out the bars easily in the shop, on a trainer or something. Maybe it was never meant to be ridden? Would explain why there aren't more of them out there.

I'm making all of this up on a lazy monday morning, so grain of salt and all.