Can any one tell me where to find info on a single shot 12mm shot gun. it was made in France. On the side it says "Manufacture Stephanoise D'Armes J. Gaucher. Gaucher merged with Bretton and became Bretton-Gaucher, but this gun doesnt have anything relating to Bretton any where on it. I'm trying to estimate a value so I know what to price it for but dont want to pay $30 for an appraisel. By the way its a bolt action.