Spanish proof question...

[.45Guy]

Does anyone happen to know the significance of P.N. above the Eibar admission proof? I have heard conjecture regarding black powder, but I find it odd that a .38 special would be BP proofed in 1929, but stranger things have happened. Barrel, frame, and cylinder have the earlier lion proof. P.N. is above the admission proof.

 

[GCBurner]

Italian replicas may have a P.N. for "polvo negro", meaning "black powder" in their proof stamping. I imagine it's something similar in Spain.