19th century rose gold ring: OB, C, three crowns

by Jared

Hi Hallmark Guru!
Thank goodness you exist, there is not a lot of good hallmark info on the web. Please help me here!

My wedding band was bought from an antique shop where the proprietor told us it was 18k rose gold and from about the turn of the century. He also said it was swedish because there was a three-crown hallmark. I did a minimal amount of research and I believe he's mistaken, the "Cat's Paw" has the crowns in the other order (two on top, one on bottom) from this ring.

What can you tell from the photo below - it would be so neat to know since I'll be wearing it for the rest of my life!

Thank you!