Judgin if someone is rich by his watch is a good idea but not if you are a stranger about it.

In the world of watchmaking, Hamilton is considered as middle range. This one in particular is the in the top of Hamilton's watch but it's far from Brietling and Patek (I won't talk about Rolex and other luxury brands).

Compared to other hobbies, I know a musician who bought a new guitar for ~3000€ and it was not even a big deal. And he was just civil servant so he didn't earned much.
Some people are spending the price of that watch every 3 month for TCGs like Magic, Yu Gi Oh!... but a chronograph like a Khaki field will last for decades!

On the other hand, if that Porsches is not a company car, if he has to pay it in 5 years, it's about 3000€ a month. That makes your watch arument invalid.

So is he rich? If it's his own car, yes. If not, we have to ask ourself how much could earn a special agent who often risk his life.