One type of old fashioned or antique door lock is the mortise lock which consists of a thin rectangular box housing the lock mechanism that is installed within the body of the door.
Inside old door lock mechanisms.
Prime line products classic bronze prime line e 2495 mortise keyed knob perfect for replacing broken antique lock sets and more fits 1 3 8 in 1 3 4 in.
Cleaning and repairing an antique mortise door lock.
The best lock for a wooden door is a lock that meets the requirement of bs3621 the type of lock fitted can be a night latch mortice deadlock or mortice sash lock.
Price low to high.
Price high to low.
If you have an older house with knobs that slip latches that are stuck inside the door or other minor problems then you should follow these instructions to remove the lock dis assemble it clean and perform minor repairs.
A non tested night latch can be used for access but it must be supported with a tested lock so you would have two locks on the door.