6119 may be tough right now since it was just released. Any NYC AD may be able to show you though, if they have it - likely tough though
If you are looking for 5119 or 3119 to see in person, and live in NYC, can ask Michael Ashton, or Aaron Faber. They may have it to view
If already decided and looking to buy online, can check out thewatchbox, the keystone or acollectedman. Chrono24 also
Though I’ve never bought second hand from any of them, and can’t vouch for them, they have online presence and I’m assuming trade enough to have good reputations