Our Continental or UK members may be of help here: looking for info about a (possibly) French gunmaker in Turin, Italy during the middle of the 19th century. The name was either Piochat or Rochat, engraved in script on the top flat of the barrel "(name) a Turin". I had such a rifle, percussion with plain grain walnut stock, tapered octagonal Damascus steel barrel with 16 groove rifling, double ste triggers, vernier tang sight, and deeply hooked buttplate. All furniture (except barrel key escutcheons) was steel. The trigger guard was hinged at the front so it could be dropped down to access the removable DST assembly. The palm rest, built into the trigger guard, had grips of ebony. Caliber was 9.6 mm and so stamped on the bottom flat.