D-Link DI-604 rev E3

"WL WRT CG4" and "VER:V1.0" is silkscreened on the top of one particular 604 rev. E3's board.
 * A date code of 0443 is found on the bottom.

ThreadX appears to be the RTOS used on this device.

Additional external links

 * On the OpenWrt Forums

Possibly relevant vulnerabilities

 * Xmlset roodkcableoj28840ybtide