Henri Pieper started the company in 1859, his son Nicolas took over in 1898. The company continued through WW-1. They are known for their early semiauto pistols.
None of their pistols were ever marked "Pieper Arms Company," so I expect your shotgun is either (1) a cheapie export meant for the US market like SO many million other Belgian shotguns of the period, or (2) an even cheaper knock-off on the Pieper name by some small-time Belgian gunsmith house making cheapie export shotguns for the US market.
Barrel is probably also marked "Stub Twist" or "Laminated Steel" or something along those lines.
You have an interesting decorator piece worth up to $200-$250 depending on "looks." It is NOT a shooter - do not attempt to fire with even mild loads.
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