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I bought a few of these on Ebay NOS. They appear to be from the 80’s. I have an old one from a junk lot that could be from the 50’s. Both vents are identical. Very slow rate similar to a 1933 I think except this vent is significantly larger and retained a copper siphon tube. What is the difference between this no 3 and a 1933? And when did they start making these? They have a very art deco looking appearance similar to a hoffman 1.