hmm. Found a few new tidbits that may help...or send you down a rabbit hole
From A Pennsylvania Clock Mystery by user from Antiques & Fine Art magazine
In 1809, the estate account of the York clockmaker John Fisher recorded payments to "J. Klingman" for a "clock face" and "finishing [a] clock."
Book you might try hunting down. supposed to have 35 photos of his painted clock dials:
Get this from a library! [Photographs of clocks].. [John Fisher] -- Folder contains photographs and information sheets related to fifteen tall cases clocks. The earliest dated clock is 1773, and the latest estimated date is 1800. Most are signed "John Fisher/ York ...
Find in libraries locally link indicates the "book" is " 1 folder (approximately 35 photoprints)" and some with ownership history. It may be available online on the Winterthur Library web site (Winterthur is in Delaware.) Alas, I cant get to that site from where I am now
The Painted dial pics I've seen so far have what (in modern terms) I would call an Old English or or old Germanic typeface, which is semi logical (or stereotypical) , in that Fisher was from Germany... and per this site :
Lisa Minardi | Sulfer Inlay in Pennsylvania German Furniture: New Discoveries | American Furniture 2015
"More than half of [Yorks] taxpayers in 1779 were artisans, who represented some forty distinct trades. According to German traveler Johann David Schoepf, who visited York in 1783, the inhabitants were "very largely Germans." One of the most talented craftsmen in York was John Fisher (1736–1808), a clockmaker, engraver, sign painter, carver, and musical instrument builder. Born in Germany, Fisher immigrated to Pennsylvania in 1749 and settled in York by 1756."
Semi Logical leap being local customers may have wanted more "traditional" homeland script instead of cursive style/type signatures.