1) Famous for their larger sized watches but the smaller ones are more sellable
2) Involves a "crown"
3) Tritium?
4) 24mm - can be the diameter for your watch movement
I am drawn to guess that this is a divers watch. When you gave Clue #4, i guess Blancpain FF, vintage.
Ball uses coated Tritium, so can be a Ball Watch. Wait, their sizes are all above 40mm, thus Clue 1) above does not hold true. Ball has no "crown" or i mean involves a crown which I presumed when you mentioned, is symbolic.
I can only guess for now it is a Divers watch.