If a pin has a screw-back (some marked BIRKS) and visible horizontal lines in the red enamel, then it is wartime.
Here is the private purchase wartime pin acquired by Sgt. Charles Mann, 4-3.
Marked BIRKS STERLING.
The pin on ebay is junk; just a common association pin.
Mike's example looks promising but I can't tell in there are lines in the enamel.
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