Type #5 mortise cam, used with Marks Security Ornamental Storm Door cylinders
There are more than 17 different cams available.
Type #2 is used with Adams-Rite Locks.
Type #5 is used with Marks mortise locks.
Related mortise lock cams:
#1 cam (863G) Standard, most common
#2 cam (863A) is used with Adams-Rite Locks.
#5 cam (863F) is used with Marks mortise locks.
#18 cam (863R) is used with Lori Deadbolt Lock