http://uk.vin-info.com/
Look up the VIN and see what it tells you. From the pictures it definitely looks like an 07 model, but that's not to say it wasn't built in 06. Quite often Gas Gas would release and updated model later in the year which they would call their race model and have a few upgraded parts and elements from the next years build.
What forks are they? Look to be coated or fitted from something else.
Edit: Found this one -
http://motoprofi.com/motospecspictur..._300-2006.html
Info suggests they came with Marzocchi and Ohlins forks, and pictures match yours as well as listing as an 06. I'd be inclined to say it was an 06 Race model and came with the better suspension package and planned upgrades for 07 chassis.