Slicer,
The "current" standard EDC is 154CM. When we first brought the EDC out, it was 420HC. Starting this year, 2002, we discountinued 420HC, and went with 154CM as the standard blade steel for the EDC. All of the 154CM blades are marked with "154cm" etched on the blade. The special AG Russell exclusive D2 EDC's are also marked with D2 ecthced on it. Of course we mark the TALONITE EDC's with TALONITE.
The only EDC's that are not marked with what the blade material is is the original 420HC knives.
The current standard, or "Enhanced EDC" is also easily identified by the black coated clip, thumstuds and screw heads.
Thanks for the interest!