Hi, it looks like Imari. As mart said, Imari is a port in Japan. As originally these wares were shipped from that port, they took it΄s name, but actually they were produced in around the town of Arita. There were and are many kilns that produce a wide range of quality, so without a mark it is impossible to find the maker. To me it looks like the middle ornament was printed. This occurs on some pieces from the late 19th century on. Yours has indeed a not so old overall appearance, but it is difficult to decide somtimes... As to the "clowns", I would think they represent dutchmen, wo are sometimes depicted on imari as they were the only foreigners that were allowed to trade with old Japan for a period of nearly 200 years...
Mat