Type  Vintage fountain pen  Product Name  Parker Duofold button filler aka Geometric aka "Toothbrush." This is the full size (there is also a slender size). Manufacturer and Year  Parker, made in USA -- 1939 (the barrel...

Type  Vintage button filling fountain pen. Product Name  Parker Duofold Button filler aka "Duovac." This was the "Man" version made from 1939-41. Manufacturer and Year  Parker, made in USA -- 1940 (the date code is a clear 0...

Type  Vintage fountain pen  Product Name Parker Duofold Vacumatic filler aka "Duovac" .... this is the "Junior" model with two thin cap bands and no Blue Diamond on the clip. Manufacturer and Year  Parker - Canada (No date...