Schlage E Series entry function handleset. These locks are no longer available from Schlage. . A direct replacement of these units is $1500.00. The door must have an oval cut in order for these units to work properly. They are a commercial grade lockset. Locksets will come with two keys per unit.  This lock comes with the pictured brass door knocker.
This lock has been re-plated in brass so it looks like brand new.

Specs can be found below:

For fine residential doors door range standard 1 1/2'' to 1 13/16''

This unit comes with a brand new 2 3/8" latch

comes standard with 2 3/8 backset. 2 3/4 available for an upcharge.

mechanism made from cold rolled steel

Entry lock: unlocked by key from outside E51PD. Dorchester style E Series design.