When was the eight-day watch invented?

1908, the world's first "eight-day chain" watch was invented and patented. This Swiss eight-day pocket watch is undoubtedly the representative of its eight-day chain. With a diameter of 65mm, it has no handle, exquisite white porcelain plate, white copper sleeve, 15 eight-day chain movement, and 5-speed adjustment. Swiss patent number 33236 is engraved on the movement, which must be the patent of this world-famous eight-day chain. Eight days after winding, good times!