Model identification guide: The Lockdowns
arker boasted the Vacumatic to be the first self filler without a sac, which wasn't entirely true. However the filling mechanism was an innovation.
By using a diaphragm rather than a sac, the whole barrel could be used as a reservoir. The principle workings was essentially like that of the earlier button fillers as the depression of the plunger pushed on the rubber sac and forced out the air (creating a vacuum) and when the rubber regained it's natural form the ink got sucked into the pen to replace the air.

here were three basic models manufactured with the lock down filler. If You take a look a the body imprint, You will find either of the model names Golden arrow, Vacuum Filler or Vacumatic.

Click on the imprint that looks like Yours!

Golden Arrow

Vacuum Filler

Vacumatic

Can't read the imprint

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