The original type of lock used in England and Ireland. It is of a basic design originally of a very stiff lever and a bolt with wards being the block. As wards were outdated in the centre of the key, it became normal for them to be placed on the sides of the bit. Although today these are still produced they are mostly for internal doors and are not used for high security.
Made by MW and Co.
Contains lock side only, no latch.