<span style="font-family: verdana,geneva; font-size: medium;">Bernie -</span>
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<span style="font-family: verdana,geneva; font-size: medium;">The vacuum with the orange band you are referring to is the Model 725, which debuted in approximately 1929.</span>
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<span style="font-family: verdana,geneva; font-size: medium;">You may want to work "backwards" by taking the design patent numbers from the bottom of the earlier models you are curious about (they start with a D) and see if Dreyfuss' name is connected with any of them on the original patent.</span>
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<span style="font-family: verdana,geneva; font-size: medium;">I have a 1935 ad that clearly shows that the Model 825 was marked as a "Dreyfuss-designed Hoover". The ad is dated March 16, 1935. Interestingly, this model is nicknamed "Sentinel 35", denoting it as part of the Sentinel Series Hoovers. This is the first ad in which Henry Dreyfuss' name is mentioned that I could find. His name is not mentioned on the Model 300 ads, though that alone may not mean anything. As previously mentioned, the Model 150 had probably been on his drawing board for several years before its early 1936 debut.</span>
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<span style="font-family: verdana,geneva; font-size: medium;">Good luck.</span>
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<span style="font-family: verdana,geneva; font-size: medium;">John Lucia</span>