The Simplo Filler No. 2
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!
Rösler, J., & Wallrafen, S. (2014). Collectible Stars I: 1908 - 1947.