ITEM #4030: NEW OLD STOCK PARKER BLACK/CLEAR LAMINATED VACUMATIC W/ GOLD FILLED TRIM. You don't run across red Vac pencils in the wild too often. ITEM #4075: GREEN DOUBLE JEWELED LAMINATED VACUMATIC. Parker bought the patent from him and spent a further 5,000 on getting it to work properly– that sounds like big money to spend on a pen component even today, but consider that translating that amount to current terms means they dropped what we’d perceive as almost two million dollars into the project. The way ink entered into the pen using this filler was no different from a bulb filler, as I go into on the page dealing with that filler.
The top of this cap is a larger diameter than most Debs, resulting in a longer clip than the rest of the Debs. There is also the possibility of seeing the ink, since the barrel acts as the reservoir and the common barrel material of the day, celluloid, can be made clear; the mystery of how much ink remains in the pen is abolished!