Hi Monika, I answered this already on asianart. They are sometimes taking a few days until the moderator updates comments.
The shapes and pattern of the decoration of these porcelain items are clearly Japanese. The marks are Ming style marks, that is imitating marks originally used in the Chinese Ming dynasty.
The characters read Changshou Fugui, meaning "Long life & Wealth and Honor". The whole mark consists of the double circle, auspicious characters, and a square in the middle. The mark is an exact imitation of old Chinese coins which look exactly like this, the square being a hole.