I don't think that they are particularly valuable because thousands were produced and thousands have probably survived. The very similar one that I'm holding right now was made in Switzerlandby Moeris for British
forces as it has a broad arrow on the back. It was purchased in the late 1940's as surplus by my late father when he worked on a farm. Pocket watches were popular at that time with farm workers because much of the work was manual and, on the farm where my father worked, horses were still used for ploughing and harrowing the fields. A wrist watch was easily broken and so many farm workers had a pocket watch tied to a piece of string in their jacket or trouser pocket.
Later edit: I think that my father said that he wore the watch "medallion style" on a string round his neck, as the chest was the least likely place where you got hit/banged while doing farm work. This watch did get a little further use in the 1950's for amateur motor sport, where there was a timed stage etc.