No. M. G. 420 (Glass nib)
This pen is from the personal collection of Ariel Zuñiga - a generous contributor on FPN, seminal Montblanc collector’s books, and now this website. Watch out for a series of reviews of truly rare pens thanks to AZ’s generosity!
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Though the M. G. series was priced very low at the time of its manufacture, it is a rather rare pen to find today. I have been looking for one for more than three years without any success. This makes it far more valuable to collectors than MB might have possibly imagined at the time of production!
While I haven't ever used an M. G. series pen, I have used Haro glass nibbed pens and I must say they are surprisingly good writers! I would expect the same, if not better, of the M. G. series.