What watch to present my father?

[MDon35]

Hi Everyone. So I see there's a lot of different users on this forum with a lot of different watches and I've also been inspired by some very touching stories (esp Peter`s). I have very limited experience with many brands and want to buy a nice watch for my father, my budget is in the $15000/£10000 .

His story; I want to give it to him for his birthday, 75 years. He is self made , from 13 he owned a book shop in a tent. Put himself through school and college. He has achieved much and today he has provided enough for generations to come.

What he likes; I want a light simple watch, most information my father would seek from a watch would be the date other than the time. He would prefer leather strap. He would prefer a light and slim watch. Not too fussed about Gold/Steel/Ceramic or composite.Subtle , classy and simple look.

So some watch to celebrate his life. One watch that caught my eye is Jules Audemars Ultra Thin. Any other suggestions??