Do you mean that 18435* is what's stamped on the butt? Or is the "*" intended as another digit? Is there a letter ahead of the SN on the butt (maybe an S)? What caliber is stamped on the barrel? Is the same SN stamped inside the barrel shroud (where the extractor rod is), and on the rear face of the cylinder? Are the hammer and trigger plated? Is there a number stamped inside the right grip panel?