Try searching, as there are already multiple threads. I am not sure Best = Easiest though...
Assuming you are in the US, there are watch-related websites like Watchuseek and Timezone. There is also eBay. and there is Omega Forums, if you have 200 or more posts.
But best place to sell a $200 watch is not necessarily the best place to sell a $20,000 watch.
Best way is join here, ask how to sell, then start bicker thread over "no permission to post" on sales forum, then reply to thread about asking to sell with picture of watch you have so you get sideways around rules. Wait for messages from interesting buyers.
Have right? 😜
Here is a great read on your request
https://www.artofmanliness.com/2015/06/03/tips-for-selling-your-stuff-online/
The hardest part of selling for me is the part where you pray and hope the buyer doesnt screw you. Just as they say you have to find the right seller, you also have to find the right buyer. One bad buyer and it can ruin the whole hobby for you....
If it's crap, sell it on ebay.
If it's something really nice, sell it on here.
If it falls somewhere in the middle, er - I haven't got that far yet.
