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Hello dear Sirs.

My ancient article from Swedish (the year 1856) bears the silversmith‘s mark BOA (or ROA).
Help me please to identify it craftsman.
Thank you.

I'm pretty sure it's "F.O.A." for Fredrik Oskar Ahlström (1818-1885), working in Södertälje from 1846. His widow, Mathilda Qvarnström (1832-1916) continued his shop until 1890.

The city mark is St. Ragnhild, taken from the Södertälje arms.

Hope this helps!

Ref: Kersti Holmqvist, Svenskt Silversmide: Guld- och Silverstämplar 1850-1912 (Nordiska Museets Förlag: Stockholm, 1995), p. 254.