00:8:21.00: Close-up on Ethan Chandler's cheap battery-powered pocket watch, whose brand name "Jean Jacot" was first registered in 2015 and belongs to a German company offering advertising gifts. The watch's quartz movement is obvious even to the layman on account of its jumping seconds hand. This watch could not have existed in 1891.
Ethan Chandler has a pocket watch that ticks once per second like a modern quartz watch and has a central seconds hand. A typical pocket watch of 1891 would typically have a smooth second hand on a smaller sub-dial. Although some watches of the day had "dead beat second" complications that ticked once per second, possibly including older Jacot watches, the particular brand shown (Jean Jacot) is a 20th-century brand.