TRENDnet TEW-638APB V2.0R

300Mbps Wireless N Access Point Product page Downloads

"0500-1130251000" is silkscreened on the board.

Trendnet TEW-638APB v2.0R - DD-WRT forums Trendnet TEW-638APB V2.0R - DD-WRT forums (internal shots)

The default SSID for the unit appears to be TRENDnet638 (value specified in manual, used per WiGLE data).