I don't really have a good answer for this one either, but I think some feel its private (and don't want others to know) like your social security number or driver's license. That's what I've always thought...
Two years ago,I sold an M1 carbine on Gunbroker,showing the ser#in a picture. A guy from Texas claimed that it had been stolen from his house six months previously.Unlikely,because my father had bought it from the DCM(now CMP) in the 1960's.It kind of sets you up for someone to scam you like that.
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