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The ED2000T Escutcheon Lever trim escutcheon is 2 5/8" wide by 8" tall by 1" thick.  The lever projection is 2 7/8"
Schlage acquired Dexter around 2000 (no product was acquired just the name).  Schlage begin selling a new Dexter product line in 2002. 
The rose diameter is 3-5/16".