The painter was Christophe François de Ziegler
The background picture is depicting a typical house of 1780 including a watchmaker's workshop in Geneva. The painter was Christophe François de Ziegler.
The action of the workmen observed by the others is probably one of the most difficult to perform, the bending of the balance spring.
At that time (and also nowadays) regarded as 'high tech'.
- At that time AP did not exist -