A wires were from the late 90s I got mine in 98, C wires original were the first titanium I think, E wires were similar to A but had a more balanced oval lens.
I have an A and an E-2.1 The A has curved ear stems with only the back ends of the stems touching my head, the E2.1 have a straighter ear stem more like traditional glasses, with a spring hinge. I thought they were more comfortable with the spring hinge.