Right or wrong, I have always assumed - mainly from reading the three links I posted earlier - that the 1985 ANH and ESB CAV Standard Play LD's was the original mix and that the new 1985 mix was the Digital Sound first heard on the JSC.

IF the1985 ANH and ESB CAV Standard Play LD's were the 1985 mix and all previous US NTSC LD's were time compressed then there is no proper full length source of the 1977 and 1980 Theatrical Stereo mixes. I do hope this is not the case.......

Edit - the ANH CAV Standard Play does not have the famous "tractor beam" line that was added to the 1985 mix whereas the Digital Sound releases do have that line - indicating that the 1985 CAV is the original mix.