Here's some infro about Pieper-scroll down a bit for Bayard
http://www.littlegun.be/arme%20belge/artisans%20identifies%20p/a%20pieper%20henri%20gb.htm
Pieper guns ranged from junkers sold by Sears and others, to fine guns. They also supplied some very high grade damascus barrels to Remington.
Those are the usual Belgian proof marks WITHOUT the smokeless proof. The R brl is 18.4 or cylinder bore at .724 and the L is 18.1 or .7126.