Montegrappa Reminiscence Fountain Pen (Large) - Octagonal Sterling, Greek Key, 18k Medium Nib (Near Mint in Box, Works Well) - Peyton Street Pens
Penbbs 350 Fountain Pen Aluminum Alloy Anode Octagonal Fine Nib Fashion Ink Pen with Gift Case Writing Set for Office Business|Fountain Pens| - AliExpress
New Unique Octagonal Seahorse Silver & Black Fountain Pen – U2029 | eBay
Kaweco Special Fountain Pen - Black - Fine Nib | JetPens
Danitrio Fountain Pen Silver Design Octagonal with Gold Trim
Octagonal Fountain Pen by 3dprintedstuff123 | Download free STL model | Printables.com
Kaweco Special Fountain Pen Black/Brass In Octagonal Format, Exclusive Fountain Pen for Ink Cartridges Including Gift Metal Box - AliExpress