I just received a pair of factory errors sold at the Leatherman Factory store.
The first is a misprint. This is my second one (both copies are red).
Neat looking PS4. It should say P4.
the second is a little harder to see. This was an S4 but printed first as a P4. You can just see the P4 in the background. Not sure if Leatherman reprinted them with a darker P4 to eliminate the white markings and then re-printed over them with the white S4. Hard for it to show in the photograph. I haven't seen this error before.