Northern clocks did not follow the fashion time line of London clocks, that was followed also by those counties closer to London. As a result you get regional variations.
Your clock shows some early features, the knopped and finned pillars, twin cherub spandrels, internal countwheel strike, ringed winding holes, style of half hour markers, provision of 1/8 hour markers, decoration of date aperture, and on the case the barley twist door pillars.
Then you get the size of the arabic numerals on the chapter ring, which in a London or Southern clock would never be seen with those other features.
In a Southern clock knopped and finned pillars would not usually be found much after 1720, in Northern clocks I have seen them 1740 clocks.
All it means is that features that you usually use to date a clock cannot be followed so closely when dating Northern clocks where they held on to features considered old fashioned further south.
Clocks were made to order, so it may be the customers were more conservative.