steingar
Taxi to Parking
After WWI watch technology had reached the point where smaller movements were as accurate as larger ones, and could be small enough to wear on the wrist. While the needs of American railroads lead to massive technological innovation in timepieces (that all took place in America) none of the mechanical movements could hold a candle to the cheapest quartz movement (so long as it has a battery) or a solid-state movement. Some of the higher end watches are still mechanical, though.