I don’t know if you would consider it, but Richmont group that owns Cartier, Alange etc., bought watchfinders, a reseller site. There is also Tourneau certified pre owned, and on watch forums, a few recommendations, i think chrono24 is one (but you can easily do a search on authentic sites ) . I only say this bc Cartier doesn’t hold its value as well (esp if without box or papers) and you can get a deal On a two tone Cartier if you wanted to experiment with two tone. Years go, none of us thought to save box or papers, so I personally wouldn’t have a problem with buying something I liked that way, bur of course YMMV. I hope you have fun looking and keep us updated on your thought process!

Also, even now, Younger family members who is normally pass stuff down to, sadly don’t seem to care as much about watches and jewelry, so I figure, just buy what you love!