TP-LINK TL-WN821N v4

Overview

 * "Rev:1.0" and "2052500371" appears to be silkscreened on the bottom side of the board in the FCC photos.
 * "Rev:1.1", "2052500381", and "GFM0120008" appears silkscreened on the bottom side of the board with serial "12C71900408".

Pictures
Retail Images 

Technical info
(on Ubuntu 14.04 LTS, Linux kernel 3.13)

dmesg [15544.200093] usb 3-1: new high-speed USB device number 5 using xhci_hcd [15544.217529] usb 3-1: New USB device found, idVendor=0bda, idProduct=8178 [15544.217536] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [15544.217540] usb 3-1: Product: USB WLAN [15544.217542] usb 3-1: Manufacturer: 802.11n [15544.217545] usb 3-1: SerialNumber: xxxxxxxxxxxx [15544.259463] rtl8192cu: Chip version 0x11 [15544.295146] rtl8192cu: MAC address: e8:de:27:xx:xx:xx [15544.295154] rtl8192cu: Board Type 0 [15544.295223] rtl_usb: rx_max_size 15360, rx_urb_num 8, in_ep 1 [15544.295281] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin [15544.295453] usbcore: registered new interface driver rtl8192cu [15544.296228] ieee80211 phy1: Selected rate control algorithm 'rtl_rc' [15544.296884] rtlwifi: wireless switch is on