You can see the model number in Settings>General>About>Model. The model number has a two-letter code, a number and some more letters. The last part stands for the country/region. The first letter can be "F" (refurbished), "M" (normal retail), or "P" (personalized / engraved). For example MC605B is the model MC605 and B is for the region.
What country does my device belong to?