Grip frame is correct with no rework marks.
It's a fine first of your 1950s, too good to shoot. Does the recoil shield show any 'circles' where the rounds made impressions? I bet it doesn't and will have a uniform look across the entire surface.
Time for one in shooter grade and then the real fun will begin, great shooters. As you know S&W had been making the .44SPL round for decades before they made that gun and had refined it. ( yes, my favorite S&W gun of all time.)
dan