As someone that works in a CNC manufacturing plant, I have quite a lot of expriance using blue print drawings. The blue print looks fairly authentic. Although the only use of GD&T is in regards to the thickness and flatness of the part, it is comman even today to use coordinate dimensioning with alittle GD&T, which is what this drawing has.
First, this is not a mold but rather a fixture that holds the metal in place while endmills cut the metal to the specifications ( not referring to the blue print)
Second, since the dimensions are taken from a "center" line it would appear that what ever is on the blue print ( not sure if the blue print is the fixture that holds what becomes the phone's outer shell or the outer shell it's self) is 63.2 mm wide (iphone 5s is 58.6 mm wide) and roughly 134 mm long.
On a side note, this drawing requires the bottom surface to be parallel to the top surface within 0.020 mm ( that's 20 microns) which is pretty tight tolerances.