There is a thread on here about the timeline, somewhere.
From what i can remember, the levers on the right, silver, came out in '93 with the cut out logo, and the skewers are pretty much in order from right to left, so probably the next one along, black, similar shape with the ball end but etched/printed logo.
There is also a timeline of their hubs which changed logo design through the years so i assume the levers did too, as ive seen a couple of different versions of the black etched ball end skewers.