TP-LINK TL-WA501G v2.22

Overview
"Model: wireless access point" and "REV: 1.2" is silkscreened on the board in the FCC photos.

Links of Interest
TL-WA501G on the OpenWrt forums (w/ internal photos)
 * 2MB Flash, 8MB RAM
 * "MODEL:Wireless Access Point A (AR)" and "REV: 1.3" is silkscreened on the board.