I remember studying the Grand Complication and thinking how did they do this?
Taking a perpetual calendar, Moonphase, Chronograph like mine, throw in the split second feature from a second Watch, then add a minute repeater from a third. Enclose in a gold case. Lots of gold.
That alone is magic, but then someone says “We could squeeze a tourbillon in” and “we’d better give it a see-thru caseback and engrave everything”
