There is only one DG 300 and it is a great guitar. It is modeled in a similar way to the Dupont's Vielle Reserve which lists for many thousands more $.
I got one recently, put argentine strings .11 on it and I'm lovin the ride
here is a link of it used by me last Wednesday
YouTube - J'Attendrai @ Tracks, Brampton
Note that the other player has a DG 250M, also a Jorgenson model
Both are superb instruments
ps : i'm the guy in the middle