Schlage E Series entry function handleset. I have two available for sale. 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. For this listing only, the  lockset will come with four keys per unit. 

Specs can be found below:

For fine residential doors door range standard 1 3/8'' to 2 1/4'' 

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. Waverly style E Series design exterior x Plymouth interior