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All the few pieces of Borkman stuff I've ever seen was out of the mid-late '20s. I'm not familiar with a dual horn radio speaker of any sort, maybe a picture would help identify exactly what you have, but regardless it's probably a high impedance driver in the range of 1500-2000 ohms... It would only realistically be usable with the battery radios of the same era, although to test if it works I have driven similar things from the line-out of a preamp or CD player or the like... Just a precautionary warning in case you're tempted, do not hook it up to a regular amplifier.
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