Medallion Pattern has been established as Hall, Elton & Company of Wallingford at least 1867 to before International Silver lineage. But what of the maker marks in serif letters...are they Hall & Elton Geneva, H, E & Co. Wallingford, or International Silver Company (up to at least 1904..information retrieved on this site)? Looking at other pieces including another such ladle, I see many detail differences both inside and outside the central element that do not seem to be explained as die wear...some details are moved or shifted and others are shaped differently.
The stamped mark is 12mm end-to-end, or about 15/32":