Based on my reading (please correct me if I'm wrong) Kershaw has produced Skylines using 4 steels?
Original 1760 Skyline - 13C26 - Also known as a Swedish stainless razor steel. ~ From Wikipedia
1760 Skylines after March 09 - 14C28N was designed by Sandvic at Kershaw's behest to have the edge properties of 13C26 but with increased corrosion resistance by adding nitrogen and chromium. Only available in Kershaw knives (as of 2012). ~ From Wikipedia
1760DAM - Damascus Steel from Alabama Damascus. Per RevDevil here on BF, "The steel in the Kershaw damascus blades is 52100, 203E, 5160, and 15N20."
1760BFC - S30V - Crucible's CPM S30V steel.
Did I miss any model/steel differences?