Wirt screw cap dropper filled pen

Wirt screw caps appear on the ink shut off and retractable nib pens – meant to be marketed as “safety pens”. Screw caps also appear on some of the self filling models, and all of the lever fillers.

Here is an uncommon screw cap dropper filled pen. The imprint just says “patented” under the Wirt and Bloomsburg lines.

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