When I state "Biggest Tell" I mean, when you look at a watch, your eyes goes first to the dial.
Reps have a hard time getting the silver rings and Lumes right.
It's always too big and shiny and bubbly. Looks like Halos
Gens have a very thin and more ambiguous silver rings and the lume is white and flat.
For me, it's an instant tell.
When I used to work at a Watch shop, I used to authenticate watches, first by the dial.
If the dial fails, I don't have to look at any other parts of the watch.
When I build my frankens, I focus on the dial first. Then prioritize other parts after.