I know a change from T-tops to Tarbacks occurred early on, but At least based on some image searches I see that block inlays, harmonica bridge, volute, neck binding, 3 piece neck and toggle switch above volume knobs are pretty consistent across the SG Standard from 1972 to 1979. Was the neck profile always the same? Fret size ever change? How many pieces were the mahogany bodies made of? Were potentiometers 300 or 500? Were certain years heavier than others? Thanks for any historical info you all can provide!