Anyone guess the Gregtech version?
That is GT-1 for 1.3.2. It is so easy, one can see it on the first "somewhat"-MetaTileEntities (the automation Blocks), since there are only so few of them.
Most features of those Versions were extremly ugly Code with a lot of hacks back then. I always try to clean up my Code, so stuff ends up getting lost, and then I try to do new things more often than bringing old things back to life.