Another thought, reading the documents again and as you pointed out Martin, is that the counterfeits John Barber was talking about were stamped either "I. Barber" or just "Barber" and were packaged and sealed to resemble a John Barber. He states that he stamped his razors "...with his own name John Barber confiding in the honor of the trade that no one would infringe upon his right..."
This makes me confident that the razors I have with the name John Barber on them are all authentic. The frameback without the name is still suspicious to me though.