what do numbers in model mean?

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Schlage and Falcon use the P cylinder suffix to designate conventional key-in-lever (KIL) 6 pin cylinder.  The D means that the lock will have a deadlatch.
The date is a 4 digit #. The first 2 numbers indicate the week it was made, and the last 2 numbers indicate what year it was made. On most surface mounted closers, the model #,  date code, ...
         
  The Legacy wall mounted readers are replaced as shown in the table below:  The MTMS15 and MTMSK15 did not have any prior models that it replaced.
To determine the SC series, measure center to center on the closer body bolt hole mounting pattern and an overall description of the closer and arm. SC91 -- 6-3/8" x 3/4" -- unique arm SC93 -- 9-1...