U boat watch chimera 46 opera nera featuring a full black diamond pave on the dial the u boat chimera 46 opera nera epitomizes ultimate luxury u boat watches have created a 46mm masterpiece to add to their exquisite chimera collection with baguette cut rubies at each hour location to replace the numbers on the dial protected by a sapphire crystal glass the u boat chimers 46 opera nera is powered by an expertly crafted mechanical automatic movement which offers an impressive power reserve and