One of the photos you posted in your eBay ad appears to show a dent / damage below the lip at the top of the filter, I've highlighted the area:
I would like to learn more about these original PF-25 filters. I'm a member of the CorvetteForum however haven't been able to locate any articles on the subject and a Google search doesn't produce much either. Which articles are you referring to that discuss how the factory original PF-25s where printed? You state your PF-25 has a "super thin" or light print impression, clearly it does. You go on to state in your eBay post that
all factory installed PF-25 stamps were similarly lightly printed. Charlie's, which I posted a photo of has a full print impression. Where does your information come from? The PF-25 is based on the embossed bottom PF-25 that trades for $300+ in mint NOS condition.