Could you tell me something about this signature?

At the beginning I would say, that the most bright element in the picture is a piece of a decoration - it is not the sign.
What I know? It is from Sweden, and it's 830. Probably it is not possible to tell anything more, but I wanted to be sure. Because, I guess it is also "M" sign there???? And why there are not "S", near the Swedish national mark?
It's not the item of very high value, I just wanted to know more about it ;)
Thank you VERY MUCH for any answers.
~Kuba