This one I used to have in my bedroom when I was a kid.
No idea how, but I managed to sleep through the 30-mins noise within a few days.
Let alone the heavy ticking of the pendulum, which might just have been the thing to put me to sleep.
The OP didn't specify "ticking" loud. So I'll post 3 candidates.
For generally loud it's my Vulcain Cricket or my Citizen 41 when the alarms goes. I really don't know which one is louder. They are my loudest alarm watches by far.