Product: Sash Controls Detroit.
Exterior handle side info: 1060-1256
Interior Handle side info: 1060-1255
Dave Sr. from SWISCO responded:
October 16, 2017
I'm not sure what you have, exactly. There are two potential matches: our 82-035, which uses an 82-218 mortise lock, and our 82-003, which has a built-in hook latch. These are not interchangeable, so you will need to confirm which type you have.