Hello! I'm hoping to get some feedback regarding a donation pen that I sent to Montblanc for repair service. The pen is a 6yr old Johannes Brahms. I sent it in because the nib started writing scratchy out of nowhere and the piston knob was collecting ink. I was told the pen was basically deep cleaned and returned. Once I had it back, I noticed that I could not see the ink window of the pen. So I returned the pen again and they basically reported back that the pen and it's replacement parts do not have an ink window. Which makes no sense since the marketing material clearly shows an ink window. Did Montblanc switch the body of my pen without documenting it? The pen did come back with it's issues fixed and writing perfectly fine. But now I'm perturbed about my missing ink window.