That Swiss watchmaker did not have at his disposal an atomic clock, or even better, our new atomic clock which employs stable isotopes and is far more accurate. Extreme precision timing has many useful and delightful practical applications including cryptography, computer security and even stealth aircraft detection based upon the measurement of extremely subtle Coulomb effects of electromagnetism manifest over extreme ranges.
In 2022, I reasoned that all matter, whether it is unstable or not, undergoes subtle thermal changes resulting from the same electron alignments which give rise to proton plucking from the nucleus based upon Coulomb effects. A LASER bolometer is used to measure these telltale heating events which, although they do not include decay, occur with the same rhythmic predictability as decay in cesium. The mechanism for this precision time is much smaller and requires less energy. They can also be arrayed and averaged to further improve accuracy just as extant atomic clocks may be.
I forgot to mention that computers may work according to different principles when precision timing is incorporated within computing systems. For example, in my perpetual transfer random access memory concept, light revolves around a kind of carousel and information is stored according to timing, never resting in a single position but its position in the carousel always being predictable and accessible by performing a read operation at a very precise time based upon the knowledge of the total length of the circuit, the speed of light and having an extremely precise clock. It allows for many terabytes of information to be stored in a small random access memory chip. The same precision timing can enhance quantum computers by allowing for transient changes to the magnetism of tiny nodes within transparent glass nanospheres to be used to alter the speed of light in measurable ways so that the magnetic state may be used to represent a variety of values other than zero and one. All of this requires microscopic atomic timing.