Looks like they forgot to silkscreen the board 
The image of the back (with components on) could be a bit clearer.
Looking at the front (the side with the big metal can) the second pin (from the left) is most likely GND but without a clear picture of the back cannot figure the other pins out.
Wait for other peoples opinions and hopefully grab a better image of the back but my guess is ANT, GND, DATA & VCC or ANT, GND, VCC & DATA