Vacumatics were Parker’s main product from 1933-1948, with overlaps representing the generation between the 1920s-30s Duofolds and the 1940s-50s 51s. As with every major generation of Parkers, the Vacumatics introduced significant product enhancement and innovation. “Vacs” were the first major vacuum filler, with a sealed pump pulling ink into the pen’s barrel. To see the ink, Vacumatic barrels were made with transparent celluloid, the transparent portions in narrow rings alternating with black and colored opaque rings. Finally, Parker’s own arrow clip first appeared with the Vacumatic. Over the years, they were produced in a wide variety of sizes, colors, patterns, and in three generations of pump technology. Today, Vacs have proven their durability by the vast number that are still available for restoration and new use. Good, durable, attractive pens.