Buffalo WHR-HP-G300N

Overview
The device appears to be a Cameo product.

The default SSID appears to be the MAC address (no delimiters, upper case hex letters).

Links of Interest
On the DD-WRT wiki On the DD-WRT forums (AR9283-AL1A part mention, high res board shot) On the OpenWrt forums, and again
 * This device is apparently now supported in Attitude Adjustment.

On the DD-WRT Supported Devices table

Listed on the 'Buffalo AirStation' page on Wikipedia (note: listed as having 8MB RAM)

Pictures
Retail Images