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American Bosch is the brand. If you know the tube compliment and have Riders manuals (lots of scans of them on the nostalgia air site under resource by manufacturer) pre-1935 you can probably figure out the model based on the tube layouts listed for the brand.
Not a very common brand...I've only owned one and seen few enough to count on one hand...It looks like a console though and most consoles are a hard sell at any price.
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