Hi Andra,
The hallmarks in your watch case show that it was assayed in London in 1933/4; these date letters are changed every year and repeat every 20 years and sometimes the styles of the fonts can look very similar across the different series. In this instance, the sequence beginning in 1856 uses almost the same font as that for 1916, but the shape of the surrounds ('cartouches') is quite different and indicates that yours is in the later series.
By this time in their long business history, JW Benson were retailing imported movements, (mostly from Switzerland), including some of good quality from factories such as Longines, as well as some of more modest pretensions, and I think that yours is one of the latter. They did sell, and indeed make as well as commission, many watches from the UK, but the economics of this became harder to sustain.
Regards,
Graham