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[[Image:InkShutOff.jpg|left|thumb|''[[Ink Shut-off]]'' scheme.]]

[[Image:InkShutOff.jpg|left|thumb|''[[Ink Shut-off]]'' scheme.]]

The ''[[Ink Shut-off]]'', illustrated in the figure, was just another wrong investment: promoted as a mechanism capable to block the flow of the ink form the pen when the pen was closed, to prevent leaks because of pressure changes, (as was the case with air travel, which was booming at the time) it was indeed ineffective, so that the company was forced to withdraw it from the market by an order from the Federal Trade Commission.

The ''[[Ink Shut-off]]'', illustrated in the figure, was just another wrong investment: promoted as a mechanism capable to block the flow of the ink form the pen when the pen was closed, to prevent leaks because of pressure changes, (as was the case when travelling by plane, activity that was booming) it was indeed ineffective, so that the company was forced to withdraw it from the market by an order from the Federal Trade Commission.

Around [[1935]],<ref>one appears in this [[:File:1936-12-Wahl-Doric.jpg|french advertisement]] dated December 1936 but in a 1935 catalog showed in [http://www.fountainpennetwork.com/forum/topic/240156-my-1550-eversharp-mystery-pen/ this discussion] a [[plunger filler]] [[Round Doric]] is shown.</ref> following another innovation made by [[Sheaffer]] after [[Vacumatic]] launch, were also introduced new [[Doric]] models with transparent body and new filling system (called ''[[plunger filler]]''), the same filling system was adopted even for some [[Vacuum Model|economic models]], similar to the [[Doric]] but produced in round smooth celluloid. In the late 30's, despite the introduction of other economic models such as [[Pacemaker]] and [[Air-lite]] the [[Wahl Eversharp]] was constantly losing market share.

Around [[1935]],<ref>one appears in this [[:File:1936-12-Wahl-Doric.jpg|french advertisement]] dated December 1936 but in a 1935 catalog showed in [http://www.fountainpennetwork.com/forum/topic/240156-my-1550-eversharp-mystery-pen/ this discussion] a [[plunger filler]] [[Round Doric]] is shown.</ref> following another innovation made by [[Sheaffer]] after [[Vacumatic]] launch, were also introduced new [[Doric]] models with transparent body and new filling system (called ''[[plunger filler]]''), the same filling system was adopted even for some [[Vacuum Model|economic models]], similar to the [[Doric]] but produced in round smooth celluloid. In the late 30's, despite the introduction of other economic models such as [[Pacemaker]] and [[Air-lite]] the [[Wahl Eversharp]] was constantly losing market share.