It's very cool no doubt.
But I'm a little confused.
If there are no electric components, and it was in fact made in the u.s., why would it be a snooker register from so long ago. ( non electric registers are VERY early, maybe even earlier than snooker)
Maybe it's a snooker register, not made by waterbury, but someone found a waterbury key that fit it?
Maybe it's just a pool register, not snooker, not made by waterbury ( pre waterbury because it's very Victorian)
Maybe it's not a pool register at all but something like a ship's clock, or process timer clock? (punch clock)
The heavy nature is also unusual for a " portable" unit.
Fwiw I've seen a photo book specifically about waterbury clocks for $8 on amazon