This is an antique Royal Rudolstadt Prussia B saucer with yellow and red roses and gold trim.
It is marked on the bottom "Royal Rudolstadt Prussia B."
It measures 1" H x 5.6" D.
In very good condition with a couple of spots on the gold trim that is lightly rubbed off or may have light scratches that I was only able to detect with a magnifying glass. See pics as they are part of the description.