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davidcyclebackBrace himself died recently, so reprints could be by him. Obviously, the postcard can't be from the 1930s due the Kodak stampbox. It appears to be a Burke image and, due to clarity and detail, possibly from the original negative.
The seller has some vintage original Burkes so he may have acquired a collection. If you buy a photographer's or newspaper's archives you'll usually get all sorts of stuff, as even photographers sometimes made reprints of their old photos.
One last note, Brace typically wrote the subject's name in blue ballpoint pen on the 8x10 photos he made, including reprints.