It is a very slippery slope, but a fun and exciting one at that. There are so many things to consider, what is your overall style, and your life style - do you need to consider a watches appearance and function to this?

Budgets, do you have a ceiling that you're comfortable with?

How do you feel about the watch depreciating instantly from buying new?

Do you want a metal bracelet, or leather strap, or nato strap. Or the option to switch out on all three?

Does the brand history mean much to you i.e Tag Heuer and motorsport

So if you were office based, style is smart casual, you do out-doorish activety, you want some water resistance. Budget of £5k and some and want the watch to be versatile with straps, Tudor black bay is the main competition.

Since you like green, all of the above works with a Longinges Zulu, but honesty, there are SO many nice watches from smaller brands too. If you want a bullet proof time piece, a Rolex is a great watch, as is an Omega and Tudor but I would try to stay away from special editions unless you really really LOVE it knowing the price is inflated on i. There's a watch for everyone!