My SCSW makes no mention of white outline rear sights in this period and your front sight is supposed to be a plain black Patridge. In addition your revolver should have a 0.265 wide serrated trigger, not a smooth one. I expect that what you have is a Shooter's revolver that has been customized to improve it for competition. Most likely that competition was Bullseye and I'd bet the shooter was over 50. Because once you hit 50 you start looking around for any option available that makes handgun sights more visible.
BTW, I am now well past 50 and my 617 no dash currently is equipped with a J Point Reflex so I speak from experience about those over 50 looking for any available assistance with sighting.
As for a purchase decision, that is dependent on the price. What you have described is certainly NOT a fine collectable, so it's value in those terms is basically nill. However, it is a fantastic target revolver that can provide a lifetime of inexpensive and enjoyable shooting, so in those terms it should carry a value of 400 to 700 dollars depending on condition.