G-U 55/92 EURO Monolock door bolt mortise lock; Single Point Mortise lock with radius ends.
Application: Single Point Lock
Series: Key BELOW Lever
Backset: 2-5/32 inch (55mm)
Face Plate Width: 5/8 inches (16mm)
Faceplate Length: 11-1/2 inches (292mm)
Cylinder Type: Euro Profile, 5 pin cylinder (not included)
Markings: G-U 55/92 stamped in lock case
SEE additional images for more info

To Operate Lock:
Lift handle to throw deadbolt
Turn thumb turn or key to secure in locked position

To Change Handing:
Handing: Reversible
1. Lift handle to extended deadbolt
2. Depress slot behind latch and pull latch out
3. Depress handle to retract deadbolt latch
4. Rotate latch and push back in till you here a click
5. Test Lock
Be sure to operate lock to verify that it functions properly before installation.
The spring latch should retract flush with faceplate if installed correctly.

Note: If you have a hard time getting the spring latch to pop out. You can unscrew the faceplate to reverse handing.

 
How to Rehand a GU Single Point Lock