This is a Sheaffer Vacuum-Fil in red marble celluloid c. 1935. Vacuum-Fil was a sub-brand for Sheaffer, introduced in 1934 and featuring a new single stroke plunger filling system before it was applied to Sheaffer branded pens. After introduction, Sheaffer treated Vacuum-Fil as a sub-brand and introduced lever fill models, such as this 4 5/8 inch long junior size pen. The Sheaffer name does not appear on the pen. The gold plated clip, barrel imprint and unhallmarked gold Number 3 nib all are stamped Vacuum-Fil.