Great topic.
My collection is pretty theme-based, and JLC is the focus, so a Reverso Platinum No. 2 for me. Rarely seen, historic, beautiful, elusive in collector hands, and hard to corner for photographs. Sadly, I have no original photography to illustrate, although I've had the pleasure of wearing the watch... I feel as though Nicolas and auction houses account for about 90% of the known photos ever taken of the PNo.2 
Best,
Tim