I'm not sure how well versed you are in the props, but just in case:
A New Hope: Regular Graflex the way it comes, 7 t-track randomly beveled or with curved corners, calc bubble strip in the clamp and a sloppy D Ring tab, riveted with two rivets. There appear to be 4 rivets in between the grips on the other side of the saber (away from the clamp)
Empire Strikes Back: Graflex with two red buttons (they lost the glass eye or something), 6 t-track with notches taken out, and pan head philips screws put in. I personally think they were Hi-Lo screws from electronics. The hero at some point had tiny screws affixed to the upper right of the grips too, no idea when that happened. Kobold flash clip with a D ring riveted to the bottom. There was at least 1 real Graflex stunt saber too.
TFA, TLJ I'm pretty sure they used 6 resin grips, with one rivet in each, I forget. Glass eye lathed down to the brass. tape over the logo, replica kobold clip with a D ring on the bottom.
ESB is my personal favorite, but most people start with the first one. It's sentimental, teaches you a lot of model making tricks and is very hard to screw up.