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Some where in the back of my mind it rings a bell, but can't place it. Could you post a picture of it or any of your other items? I've collected some of these slide rules and gadgets just for the fun of it and for display. Most of them I bought were in the $15 to $20 range. Although some start out in the $30 to $40 range but come down.
A lot of these items do have patents, so your might do a google patent search. There where people making these slide rules as far back as the 1920's. They had to market it somewhere. Most likely the DRF or racing magazines of the time.
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