I cam across a set of very small, expresso sized cups and plates with the marks I can not identify. The marks are not the most common "standard" marks listed on the "World Marks" pages of the web site. Browsing through this forum was not successful, so I am asking for help from members here. One of the marks reminds me of Arabic "90" but I am not sure. It is a smaller mark seen below, either on the side (picture #2), or upside down (picture #3). The other mark is unknown to me. Thank you for your help.