Clock/watch tools

Former watchmaker's universal key – LA CENTRALE BIENNE SUISSE – opens Rolex cases / vintage watches
Old Swiss professional watchmaking tool marked:
LA CENTRALE – BIENNE SUISSE
Universal key used to open watch backs and screwed cases.
Set including:
the universal key,
several interchangeable tips/pads,
the original illustrated manual.
The manual mentions in particular use for certain cases of the Rolex type.
A very fine object for:
watchmaking tool collectors,
enthusiasts of vintage watches,
workshop decoration,
or use/restoration.
Estimated era: 1940s/1960s.
Condition: antique tool with normal signs of wear and age, sold as seen in photos.
Fairly rare item with original manual.
Not complete as the tips C,L,B,K are missing.