Astral - if I understand your request, i.e. is there a book that will list all the people who may have worked on your watch? the answer is no.Is there a book on tool markings that help trace any of the 20-50 crafts people who worked at that time
Very, very few of the workers left their mark on the component of the watch that they made. You do sometimes, when the watch is dismantled for service/restoration, find maker's initials on the two main plates that support the escapement. Through research it may be possible to identify a short list of possible candidates, by matching the initials to listings of workers at the time. This is by referring to contemporary trade directories.
C18th trade directories are thin on the ground. Your watch was finished in Coventry, but it is probable that much of the initial work producing the plates and the escapement into an unfinished state, was performed in Lancashire, in and around Prescot. There is a trade directory for 1795 which you can find on this site. If you read through you will see many occupation descriptions of workers involved in the watch trade. Prescot was very much the industrial hub for watchmaking at this time and some of those listed may have worked on your watch.
In contrast the listing for Coventry are not so detailed and the occupation of those involved is simply described as watch & clock maker. It is not until we move to the Coventry directories of the C19th, when the industry in the town expanded, that we find more detailed descriptions. This does not mean that some of the workers were not performing the tasks described in the Prescot directory, but they would have been relatively few. Those that did were, in my opinion, likely to have been working almost exclusively for the dominant watch maker at the time, Vale & Co. Even in those cases they were probably working on movements that had started their life in Lancashire.
Here is the listing from a Coventry trade directory from the time your watch was finished.
and this from 1818 - when occupations were starting to be described in more detail ...
Hope that helps.