Hey Tracker, I do have "NDS" on my slied but no PSP on the gun anywhere. Have P7 on the grip.
I do belive I have the original box and on the decal on the box is, "P7PSP 9 T25 SILVER SLIDE", above that is "HKP7SIL", on the very top of the decal is, "881985", and on the bottom is the serial number 3754*.
Do you have wood grips on yours?