For me the leather strap. I can’t imagine the heft of a 50k platinum bracelet ! Plus I tend to not like bracelet other than sports watch. Otherwise this ref really caught me off guard. I don’t really like a lot of the zenith design language but the platinum case and the different details in the dials and markets. Superb. Holding me back is that I don’t really like the movement finishing at this price point. Also holding me back is I really want a 1908 in platinum and that would make this watch redundant. My dealer says they haven’t even received a 1908 platinum so who knows if I’d get it. They say I showed interest fist and have been forthright with my sub, Pepsi and gmt white dial. 🤷♂️