Hi yes its a 38 S&W D.A.3rd Model made from 1884-1895 Serial range 119,001 to 322,700 roughly 203,700 made very nice 6 inch gun cool.Theres not much to the innards in those firearms probly needs a good cleaning before you take it to a gunsmith spray tons of brake cleaner in there or carb cleaner and will loosens all the old dried out grease and dirt and blow it out with air compressor or can of air and you will notice a big difference 95% of the time there all gunk up. Enjoy that gun shes a beauty. They also had problems with the sear in those 3rd models. The 4th model they put a heavier sear in them for better Double Action trigger pull. But i dont think its your problem may just be dirty inside..
Rick