Welcome to the forums from the Wiregrass! We can tell you a lot more if you post some pictures of it. ABR1360 is probably the serial number which indicates a 1983 manufacture if it is on the butt of the gun. That's the official location, but around the time your gun was made, S&W began stamping them in the yoke area. The 7583 is likely just an assembly number used for soft-fitted parts during manufacture.