You might have something there-also known as wind caps. Here is an example of one that has a side hole.
Here's the authors write up.
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A second pipe that I have with an integrated wind cap is what is commonly known as Hurricane pipes. This style of pipe was made by several English pipe makers. The one I have is an F&T Shipmate made for Abercrombie and Fitch. The wind cap on it is made of Bakelite and is pinned toward the bottom of the bowl on each side. It is hinged and tips backward toward the smoker for loading and relighting. The first photo below shows the cap from the sides and the top of the bowl. It has the appearance of a pepper shaker. The next two photos show the same pipe with the wind cap opened."[/FONT]