Vintage Brass / Bronze Odd 2 1/2" Backset Mortise Passage Lockset. Lock face plate is 7/8" x 3 3/8". Mortise 5/8" x 1 13/16" x 3 1/4" deep. Knob escutcheons are 2" diameter. Knobs are 1 7/8" diameter and project 2 3/8" from door or sash. Appears to just fit a 1 3/4 door thickness. No minimum thick door. 

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