This plate has similarities to another piece I have posted most recently, however the difference is, that this one has the letters DIDIM. These markings are within the plate and not on the surface. The small square patterns are fused. The plate itself has a smooth surface on the top and textured underneath. The plate/ashtray measures 12.7cm X 12.7cm. Apparently I have been informed that this particular piece was purchased from a car boot. I have not seen one like this before and have searched a number of websites to no avail. Can anyone assist me in identifying this unusual piece. Many thanks.