Why one side of the collection is shown without glass
Three movements are shown open — so that they can be heard running.
A watch behind glass can be seen but not heard. For three movements an exception was made: they stand in an open niche at ear height, and in a quiet hall they are audible from a few paces.
The sound differs in all three — it depends on the balance frequency. The collector says it is the sound, more often than the sight, that keeps visitors standing longer.
