All parts are original by the original manufacturer. If for example, we call it an Olympus, then the parts are truly Olympus, not some knock-off counterfeit part made in India or China. We purchased an Olympus BX40 biological trinocular microscope on a popular online auction service. We got this from a “reputable” dealer who had a good track record, many sales, lots of other equipment for sale, and had been in business for a number of years. When we got the unit, it initially looked great. But on further inspection, we could see that the trinocular head was not right. It was cheaply made. The click-stops for the trinocular photo port felt so “Chinese” like. It clearly wasn’t the excellent quality made in Japan that was expected. Further inspection showed inferior material composition (more plastic than metal). Also, the eyepieces were not correct. We had seen enough equipment in the past to know that we were clearly looking at counterfeit parts installed on an original frame. When confronted, the seller acknowledged that it was counterfeit made in India, but was “perfectly fine, worked great, and looked the same”. We promptly returned it. We sell only original parts. Beware as there are very good fake parts being sold.