Good luck finding the definitive proof, Fred.
These do appear to be "of the era", based on the identical lamp parts and vintage felt bottoms. The big remaining question is whether these were sold commercially.
It's also quite possible that these were prototypes made by Hartland (which never made it to market). Similar to the Gibbs Conner pieces that surfaced a few years back.
Be sure to let us know if you find any more info!
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