p9s .45acp

Some magazines have "1A.45" stamped on the bottom, and others don't (that area is blank). Does anyone have any idea what is the significance of the stamp, or its absence? Is there any difference in the magazines? TIA, Mark

Hi there I have a question for someone more knowledgable than I. I have come across the box of a P9S that I had years ago. I just noticed that it does not have the same label as my other boxes. The label says HK P9 not P9S could this be a box for one of the earlier DA only pistols? Was there any...