I had always thought Lucasfilm said the Blue White Saber of Kenobi in Star Wars '77 was a prototype Lightsaber and they never had the time or money to get it right or how they wanted it to look. It always looked Like a spinning rod with 3M motion picture screen tape on it.

Yes if you want it to look how it looked in 1977 you would reproduce the Unfinished Saber that was Painstaking Animated frame by frame onto the film, Although you would still have that funny scene were his saber turns off in the duel and you see the prop in Guiness hand,lol.

Going Back in and redoing it they wanted to make the saber consistant with empire strikes back and return of the jedi. But then they decided to Prequel-ize the sabers and the Colors as well, that was shit.