The barrel on my P08 is marked: right side: a small E/N, top left side: WaA135. Underneath: 1083 and 9mm Para (no indication of barrel diameter). On the left side of the frame: German proofs from 1977.
I have read that the Portuguese Lugers had numbers from 153m to 5322m, and this here has number 1083n.
Nahpatronen