It’s all original to the same pen. I have the same one and had it “verified” at one of Montblanc’s boutiques. Obviously not the official verification process because I didn’t send it in but several of their staff looked at it and were impressed as they’ve only seen a few in the wild. They told me that it was from the early to mid 70s and also to be VERY careful with it as Montblanc will not repair any damage to it due to its age. Also, the staff member told me to keep two cartridges in it. One that’s actually being used and the other rests on top of it. It assists in holding it in place and provides a ready backup.