The "T" designation only lasted for two models, i.e. W123 and W124 and even at that it wasn't used in the last years of the W124.

It was still less formally used longer, however, as, for example, I have a German brochure for the W210 wagons wherein the phrase "T-modelle" is used.

The proper designation, of course is "S," i.e. S123, S124, etc. A VMI (vehicle master inquiry) at a Mercedes dealer will identify a W210 wagon as an E320S.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles