Parker Duofold Senior Fountain Pen (1926-7) - Black Hard Rubber, Single Raised Band, Button Filler, Fine Semi-Flexible Duofold Nib (Excellent, Restored) - Peyton Street Pens
The Conway Stewart 485 Button Filler – Goodwriterspens's Blog
Vintage button Filler mercurio fountain Pen with semi flex steel Nib, Made in Italy, 1930 made. * SOLD * – Authentic Vintage fountain pens – Used and NOS