I think what you've got there is a Meissen tile by the hallmark. I know they did make decorative tiles, usually for around stoves or fireplaces. I think it should be quite collectable, but will let the others chime in on that since I don't have a lot of experience with these. Meissen marks are VERY difficult to date by the way. I think you'll probably have an easier time determining the age by the style of the clothing on the child.