Hi everyone, can anyone help me verify the authenticity of three MB fountain pens I've purchased over the years? I'm a collector (not a dealer) and they all write nicely, but I want to make sure they're real.

MB 144: https://drive.google.com/drive/folde...8n?usp=sharing

MB 146: https://drive.google.com/drive/folde...4A?usp=sharing

MB 149: https://drive.google.com/drive/folde...or?usp=sharing

If you need any other angles, please let me know. Thanks so much!