This specimen, which is in good condition considering its age, is still capable of operating although the key is missing.
The spring, bolt and other moving parts functioning as intended.
A typical feature of the key for this style of lock is that the shoulder is found partway along the key bit, which locates against the central bridge ward.
Size: 360mm x 220mm x 40mm. C. mid 18th Century.
A Banbury lock is one where the various component parts of the mechanism are separately fitted into a block of wood, not to be confused with a stock lock where the lock parts are mounted on a metal plate which is then let into a block of wood.