Not every piano was delivered with a lock and key back then - just like today. Why should a piano be locked? In fact, locked pianos are often damaged in an attempt, or anger, to open them. In public areas, it may be necessary to be able to lock a piano - even there we recommend other systems rather than a simple key.
However, keys are decorative - and where there is a lock, there should also be a key. The majority of piano keys were kept simple and were only there for the function. However, manufacturers also made particularly beautiful keys with company emblems or lettering at the customer's request. These are very rare to find in their original form today. We always have a selection of these rare keys and can also have authentic replicas made on request in co-operation with master belt makers and foundries.
Most pianos fit standard keys with a plain beard. Some pianos had triangular or star keys. Wing keys are usually longer than piano keys, as they have to protrude over the edge of the lid.
If a lock has not been used for a long time, it should be removed and cleaned so that it works properly again.