here in Indonesia, Samsung Galaxy Tab2 is sold in 3G 16GB version
there are no color choice, no wifi version available in Indonesia (officially)
yes, mine do have ARMv7 Dual core @1008 Mhz , PowerVR SGX540.
but this one does not have infrared port (dvd or tv remote control fuction, as some website says), it does not have face unlock ('though yes, it's an ICS), i don't get 48 extra gigs from dropbox, but it does support voice call and video call over it's carrier network (GSM/HSPA+)
and the type was written as GT-P3100 (Espresso)
so, my conclusion, yes yours is a legit Samsung GalaxyTab2, it's just the matter of Developer version installed on yours.