The Eastar S3 is a 35mm coupled-rangefinder camera made by the Tianjin Camera Factory in the 1960s. It has a 50mm f/2.8 Eastar lens stopping down to f/16 and focusing to 0.8 metre. The shutter has speeds 1 - 1/300 second, plus 'B'. The camera has a cold shoe for flash, and a PC socket on the front. It has no light meter. In specification, it is very similar to the Yashica J.
The characters on the front read 'Dongfan' ('East' or 'Orient'). Examples may be seen with this on a red badge instead of as an engraving.