NigelKTolley wroteNo, just me using the logical name for the locks that take ‘Church keys’.
‘Church door lock’ is a term for the large rim plate stock locks (typically, but not always) 2-bolt, having metal bands or other decoration in ecclesiastical style.
They were commercially produced from the end of the 18C until probably the 1920’s. They were popular with gothic revival architects and (mainly Anglican) clergy, and the Arts and Crafts movement. They were used not only in churches but many other gothic and Arts and Crafts buildings, village hall, parsonages, and some country houses. They are stock locks of good quality and large size, and many are still in service.
Like stock locks generally, they have bridge wards. These are usually fine wards, but solid wards were invented c1819, so that is one limit of age. Many keys have ward cuts for sash wards. However, many serve only to impress the buyer. Earlier locks are more likely actually to have sash wards. Even when there are sash wards, later locks tend to have the sash wards on only one side, the backplate OR the cap but rarely both. Locks for churches, especially early in the 19C, are more likely actually to have wards on both backplate and cap.
Locks with a brass keyhole bush are better quality than plane plates, and seem to be uncommon pre-19C - but that is not much of a guide.
Iron-cased rimlocks date mainly from the late 16c. Before that, cases were uncommon. Plain brass rimlocks are uncommon before the 17c. The improvements in brass production in Britain, and sand-casting, made brass objects both more abundant and less expensive.
Early rimlocks have cover plates covering only the keyhole and middle part of the back of the lock. Later locks have backplates completely covering the lockcase. Large sheets of thin rolled iron became possible from 1720. Early lockcases had straight sides which are typically wedge-shaped in profile. Grooved rolls able to roll a great variety of sections were invented in 1783 but were not common until the next century.
Royal warrants have a long history, but goods really began to be marked with the royal arms and initials in the time of George IV. Queen Victoria greatly extended the practice of granting warrants, and many locks continued to be marked VR into the 20c, often with a crown, though without any warrant.
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