My 686-4 is wearing the original Hogue grips. Would I have to remove the grips in order to make the determination? I have only removed grips on a S&W revolver once and it was kinda difficult to put the grips back on.
As long as the back of the grip frame is visible it’s very easy to tell. Feel free to put up a photo of that area and you’ll have an answer in very short order.
Look at the butt [emoji1787], seriously the above diagram is very obvious and correct one of the first things I did when wife brought our first and so far only Smith home.