I'm reasonably sure that the mark is “FH” for Fredrik Holm (1839-1922).

Fredrik Josef Holm was apprenticed to Peter Christian Romare (1805-1867) in Helsingborg in 1852 and took over the workshop upon Romare’s death. Holm and his Carl took over the shop of G. Dahlgren & Co. in Malmö in 1892, and in 1905 Holm transferred the Helsingborg shop to his daughter Hertha Holm-Bjerring (1872-1946). In 1907, she in turn transferred it to her brother, Erik Holm (1877- 1958), who sold the company in 1911 to Karl Svensson Säwstedt.
Hope this helps!
Ref: Kersti Holmquist,
Svenskt Silversmide1850-1912 (Stockholm: Nordiska Museets, 1995), pp. 125-126, mark #2016