If your rifles are Model 39A, then 1959 is correct.
However, if they are the octagon barrelled Model 39, then they were made in the late 1920s. The S prefix likely was first used in the 1925-26 era, based on serial number ranges for the non and S prefixed rifles. The HS prefix was used beginning in 1932, until the introduction of the model 39A in 1939. Your rifle was likely produced in the late 1920's or 1930, as the highest recorded S numbers are in the 16,000 range. Yours should have the ivory bead front sight and hold open rivet for the new ejector (post 1926 patent) as originally equipped. I presume barrel stamp is Marlin Firearms Corporation and not Marlin-Rockwell!? Also, use ONLY standard velocity ammo in your rifles or you will break the bolt.
shoot straight,
gewehr