The magazine "Words of Truth" (Stow Hill) 14 (1946) has an article by F. S. Marsh (page 126 and 127), to which is added at the end: "This was written by the late beloved Editor a few days before the Lord called him to be with Himself." So 1946 seems to be the right date for his departure.
In "Scattered Seed" 1888 on the page after the title page of the February issue there are names of those children who got prizes. The Second Prize for those under 12 was given to "Fred S. Marsh." This would fit with his birth in 1877.