I've seen that interesting 'P' Raimey.

Fabrique Nationale Herstal was established Oct 15, 1888 by Albert Simmonis, Jules Ancion, Dresse-Laloux, M.A.L., Dumoulin Freres, Joseph Janssen, Henri Pieper, Pirlot et Fresart, Credit General Liegeois, Nicolas Vivario, Auguste Francotte, and Emil et Leon Nagant.
Syndicat des Pieces Interchangables was established by François Dumoulin, Neumann Brothers and Janssen Bros. in 1898.

Not the usual Pieper 'P' so maybe Pirlot?