Chinese website WPDang spotted the photos on Weibo and speculated that the smartphone could be the Lumia 830.
The Verge, meanwhile, suspects that the Nokia Lumia 730 is shown in the pictures.
The device has an aluminum frame, and the rest of the housing is made of plastic, a construction that can be found in the Lumia 925 and Lumia 930.
The photo sensor appears to be very thick, similar to the one on the Lumia 1020.
The site cites an unnamed source claiming that the smartphone will be available on the Chinese market soon.