[fatmat27]

many USP's around this same time period will also have "Heckler & Koch" on the right side of the slide

 

[fatmat27]

My full-size AF date code 9mm USP has both of those markings while my AH date code USPct does not have the JS and has the standard GmBH stamp on the right side of the frame.

Sorry, I corrected my original post. I meant to say that the USP's around the AE-datecode era usually have "Heckler & Koch" on the right side of the slide.