These are two of my 149's, the one on the top is a 1950's celluloid 149 with the words "Made in Germany" on the cap. The one below has a celluloid cap without the "Made in Germany" imprint. This one however has a later (Non-Celluloid) resin barrel. Although the caps look similar, the one on the top has the early curved clip. In addition, the cap of the early pen will fit the resin barrel, while the cap of the resin pen will not fit the celluloid barrel. I would appreciate some insight and feedback from my Montblanc friends out there.
All the best!
PS: On the photo of the Montnblanc star the early cap is the one on the left, while the later celluloid is next to it. The cap on the extreme right is a later 1980's cap that I put there for comparison.