I wish I could help. I'm still a bit new to this horology thing and am just now turning my attention to the pre-owned market. One of my best friends (oddly, my motorcycle mentor) is a retired jeweler. He owned a store in South Florida but retired years ago (At 48. Tell me there's not money in this stuff... And yes, he is a lot older than I...). His insights during my watch journey have been a little helpful, but he's been out of the game for a long time and luxury watches were only a small part of his practice. His focus was handmade, custom diamond stuff the rich, retired old biddies in SoFla loved. He sold some of his designs for close to $500K. I wish he could help me more, especially as I turn my attention to the used market.