Micarta Calypso Jr was the first, started out as the CX03 Experimental I believe around '97, became the C52, no difference except the box, Came in both SE and PE all in AUS-8.
Stainless version followed very shortly thereafter. Same deal, CX04 Experimental to C52 with no changes except the box label, SE and PE made, AUS-8 steel.
Black FRN version came out in '99, also in both SE and PE. All I have ever seen are VG-10, although that timeline seems a bit early for that steel.
Not sure of total production on any of those three. From what I've been lead to believe, none were wildly successful, so perhaps a couple 1200 unit runs of each, tops?
Grey FRN, in PE only VG-10 came out in '03. First run of 1200 sold so well that at least a second, and possibly a third were done.
Current version in burgundy FRN and ZDP-189 is PE only and, unless history repeats itself, is slated to be 1200 pieces.