MH are the initials marks for MAUNO HONKANEN (mostly Jewelry, Finland) - ca 20th C but not necessarily the maker of your ring. The feather is the thing. I can't see your initials, in your ring so shall describe my initials inside mine. There is no feather in my Mauno Honakanen however the initials MH are very stylized especially the letter H.
Good Luck! Nadene
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Silver Ring by: Anonymous
wish I could upload marks but are tiny and difficult to foto but they are MH with what looks like a feather any idea who made it am thinking Dutch guy Marius Hummel or something
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STERLING? by: Mona
as you said the ring was silver the ST might stand for STERLING - just a thought.