Antique Fireman Gear Breathing Gas Mask Nib Cover's Nod And Shake 1922 Patent For SalePatent number 1,433,676 dates to 1922 USPO issue
Museum quality piece of antique fire fighting and mining or hazardous Environment equipment. Apparently never used and incredibly all the rubber and elastic is soft, sturdy and flexible with no tearing or cracking. I think you would have to look long and hard to find another one like this in the original box and in perfectly wearable usable condition. Very little info on the web about these and no others found for sale or for comparison.
Click on Link to short video showing flexibility:
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