this is a mortise lock.what is the problem?do u just need a key?is it no longer working?a new one will be impossible to find.mortise locks are not manufactured except for a few uses now.some locksmiths do try to repair them by welding parts together if they are weldable.if you dont want to...
the arrow lockset is probly keyed on the inside as well as outside.if this is so,insert your key into in inside keyway and slowly turn.you will see the steel cover plate turning inside the two screw port holes on the inside.when they turn they will expose the screws inside the port holes.use a...