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General appearance of the sensational ancient replica of the "Zhang Heng Seismograph". The height of this replica is about 40 cm. So, this cannot be a working device, but a model of a seismograph that existed and worked in ancient times. Moreover, there is no mechanism inside the eggshell, as can be seen when the top cover is removed and one looks inside. This seems to further confirm that this is only a model of some real apparatus. The pattern on this replica indicates that it could be from the "Western Zhou" period (1100 BC to 770 BC). This, in turn, could mean that the "Zhang Heng Seismograph" could be even more than 1,000 years older than currently believed. More details about this ancient replica of the "Zhang Heng Seismograph" can be provided by Mr. Tan Kee Wee, who can be contacted via e-mail at firstname.lastname@example.org.