I got to see inside of a similar clock in my youth. It was not a Gents, but I remember it being part mechanical and part electric. In grade school, I got sent to the principal's office ("Headmaster" for those in the UK) for drawing on a bully's face with a magic marker. (He got sent too, so I was okay with that.) And while we were there, somebody was working on the tall clock behind our principal. To this day, I cannot recall anything that man said to me, because I was so fascinated looking at the guts of that clock. I do remember the other clocks were off that day, but that's the only other thing I recall; this was decades ago.
It was a plain-looking clock, but I liked it anyway. A teacher later explained to me that what I saw was their master clock and it set all the other clocks. I thought it was cool for what it could do.