This is a Sheaffer Vacuum-Fil Marine Green c1934. Vacuum-Fil was a new sub-brand for Sheaffer, introduced in 1934 and featuring a new single stroke plunger filling system before it was applied to Sheaffer branded pens. The first Vacuum-Fil pens are 5 inches long and came in Black and this Marine Green, model V6H, and sold for $2.85, with a $1.65 matching pencil, but $3.95 in a set. Dealers were encouraged to compare the pen to ones costing $5 and labeled the pens at that price and the set for $6.65. The Sheaffer name does not appear on the pen. The gold plated clip, barrel imprint and unhallmarked gold nib all are stamped Vacuum-Fil. This pen came with a replacement 14 karat gold nib.