Dave Sr. from SWISCO responded:
March 23, 2017
I'm not sure what to recommend based on this photo alone. You appear to have a type of mortise lock like the 40-198, but I'm not certain. We will need some more photos of the door and the edge of the door where the handle is installed, as well as a photo of the lock itself removed from the door. We will also need more detailed dimensions. You can use our 40-198 as a reference for what measurements are most important.
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