Serotta Legend ST model, what year?

[Flinch]

Picked up this one from fellow Paceline member, and am wondering what year it was made. Yes, I've got the serial number magic decoding list, but it doesn't address this issue.

Serial# CLS 58 1033 Legend ST (carbon seat stay)
(Note that the "C" denotes "Custom" and is not part of the date determination)

Are all the Legends numbered within the same trailing digits? Or are the LS series seperate?

The Legend prefixes I've found are:
LS- Titanium Legend with carbon seat stays, ST model(?)
LE - Legend Ti GS tubing
SE -Legend, confusion between ST and SE, not sure if SE Legend prefix exists, or if it is simply a sub-model of LS series.
TI - Legend Ti, but also earlier Colorado Ti

So far I've found these numbers online, but am not sure they are correct, in fact almost sure they can't be (note the trailing numbers VS dates)

CLS 55 0972 = 2008 model,
CLS 54 720 Poster stated: "I'm pretty sure it is from 2012-2013. The NY plant closed in the summer of 2013."
LS XI 548 = 2011 (Could it be "LS X1"? Fork serial number: C LS X100548),
CLS 52 339 = 2012???

Serotta Legend + CSI....Nirvana!