NanoPi R2S

"NanoPi R2S" and "V1.0 1912" are silk-screened on top and bottom of board.
 * NanoPi R2S on FriendlyARM Wiki
 * Open-spec RK3328 SBC offers dual GbE for $22 on LinuxGizmos
 * NanoPi R2S Dual GbE IoT Board and Gateway Launched for $22 and Up on CNX|Software

Hardware specification

 * CPU: Rockchip RK3228 (Quad-core ARM Cortex-A53) @1.5GHz
 * Memory: 1GB (DDR4) SDRAM
 * Ports: 2x GbE LAN, 1x USB 2.0