AllintheXring, welcome to the forum.
Guns with the "marcas registradas" label have four lines in the address block. Before that roll marking began, Smith & Wesson revolvers had a single line address block that read "Made in U.S.A." The transition occurred in mid 1948, so if you have a single line address block, your gun was manufactured before then.
Can you share the serial number with us? X out the last two digits if you want, like K123xx. Maybe we can get a little closer on the shipping date.
Photos are nice, too. Don't be afraid to start your own thread for your own revolver.