Exceptional Pleistocene Fossil — Sinomegaceros sp. partial mandible with three well-preserved molars (m1 - m3). Recovered from Quaternary deposits along the Amur River basin, this specimen represents a rarely available cranial element of the giant deer Sinomegaceros, a lineage renowned for its highly derived and elaborately patterned antler morphology. Closely related to the European Megaloceros, Sinomegaceros occupied a pivotal evolutionary position among the Late Pleistocene cervids of Northeast Asia. The preserved mandible fragment retains three molars, exhibiting diagnostic occlusal features valuable for comparative or display purposes. Fossils of this genus seldom enter private collections, making this an unusual opportunity to acquire material from one of the most striking and scientifically significant giant deer of the Pleistocene. A distinguished and scarce addition for collectors specializing in Quaternary faunas, cervid evolution, or Amur River paleontology.