1972. S&Ws factory historian, Mr Roy Jinks, will for a $50 fee go back manually through the old paper shipping records and find your gun. He will then send you a rather nice letter giving the back ground to that model, any special features on your gun, the date it shipped and where it shipped to.
If a custom ordered gun such as a Registered Magnum or a gun potentially linked to a historically significant or person or event then this can add to the value of the gun.
If the gun has special significance through a history of family ownership, then it can help provide background/location to the story of relatives that have passed.
Other than that, it will simply satisfy the curiosity of a S&W junkie. You have to decide if its worth it for you.