I think it must be an E3, as that was the only aluminium frame in the 96 range. I'm assuming it's a 96 model, as I doubt they were still making 95 model frames in June 1995, although it isn't impossible.
Generally speaking, if it's a 1995 E3, it should have a canti bridge, if it's a 96 it probably has a little noodle attached to the seat tube instead.