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(CLS 55 0972 = 2008 model,) This could be accurate. The Legend ST was introduced for the 2003 model year but it's hard to guess how many were built each year.
(CLS 54 720 Poster stated: "I'm pretty sure it is from 2012-2013. The NY plant closed in the summer of 2013.") I would say this bike is at least 5 years older.
(LS XI 548 = 2011 (Could it be "LS X1"? Fork serial number: C LS X100548),) I believe this is correct. X=2010 XI=2011
(CLS 52 339 = 2012???) I would guess this one dates from 2004-5.
The OP's bike doesn't give much for clues as it lacks decals and paint. My guess based partly on the 0972 frame having an accurate date would be 2008-9 for the OP's frame.
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