Can't make out the mark at all.....can't even see it. But the shape and style of decoration looks German about 1890 to 1910...or Bavarian or Austrian...
Linda C

Yes, Linda, that would make sense. I have been thinking that they look Bavarian/Austrian during that time period. One of my grandmother's sisters was a governess with a family that spent time in Germany before WWI. (someday I'll share her post cards). She subsequently joined my grandmother here in America. But I was wondering if it could be an American piece from the other side of the family. I do wish I could pinpoint that mark.
Annie

do a rubbing or tracing of it and post it here....

Here's a rubbing of the mark on the cup. There is a smaller version of the same mark on the rim of the saucer back. I know it's not great, but maybe it will help you to see the outline on the previous photo of the cup back.

.....hmmmm.......??

What.....?? A crappy rubbing? I am trying!

Maybe not bad....just never saw any sort of mark like that....