Welcome to the Forum. There were a couple models of double action 38 top-breaks. The 38 Double action had a small sideplate on the left side. The other is the 38 Perfected chambered in 38 S&W. It had the frame and mechanism of the Model 1903 Hand Ejector and the barrel/cylinder of the 38 DA top-break, having a large sideplate on the right side. The theory was that the double locking system would function better with smokeless powder, but proved not necessary since the 38 S&W is a rather anemic caliber. There were almost 60,000 made from 1909 to 1920. Your revolver likely shipped around 1913 to 1914. It does appear to have a rather large barrel bulge??