Welcome to the Forum. It appears to be a very poorly cared for and filed on 38 Double Action revolver, not a Model 3. All Model 3s were 6 shot revolvers, while the 38 DA was only a 5 shot gun. The caliber is officially a 38 S&W. Cannot read the serial number, but the trigger configuration indicates a 38 Double Action, 3rd Model, except that the bottom leg of the trigger flange seems to be removed?
There are European copies of this model made, so would like to see the stamping on the top rib?