henri pieper: of liege belgium 1884-1898 at which time it became nicolas pieper. in 1905 it became anciens establissments pieper. they exported guns to the u.s.a. an entree grade double in the crescent grade. in the rating from A-F an 'A' BEING THE LOWEST GRADE [FROM HISTORY OF THE BREECH LOADING SHOTGUNS] BY CHARLES E CARTER. regards 
 The above is not true!  The Crescent guns were produced in the US.  You have the Pieper dating wrong.  If Carter states all the above, tear out those pages.
Pieper is recognised as having brought factory mechanisation to arms production in Belgium. Pieper produced guns that ranged from low entry level to high grade guns.  They did not produce bespoke guns.
As to the original poster.  It is impossible to tell the value of a gun without at least pictures.
Pete