(On hold) This is a 1943 Blue Diamond Parker "Striped" Duofold Senior Fountain Pen, a Vacumatic filler, in Green & Gold celluloid, with gold-filled trim, and a 14k gold XXF nib. This was a Parker flagship model, a large pen, measuring 5.3" capped and 0.48" in diameter.
Parker's Duofold has been the flagship model for decades, a pen that embodies elegance, class, beauty, and all-day writing comfort. A supremely beautiful, luxurious-looking pen, it resembles a Medieval stained-glass window, a true work of art. It's also a pen with superb ergonomics, with a streamlined, graceful shape, undisturbed by a filling contraption, and a very comfortable, slightly tapered section. The pen should be suitable for the vast majority of users, including those with large hands.
I could go on at length about the amazingly rich, vibrant, semi-transparent celluloid, and the high-capacity, efficient filling mechanism, but, truly, the star of the show is the 14k gold nib. Duofold nibs are renowned for their reliable performance, day in, day out, on all kinds of paper, with all kinds of ink, able to accommodate a broad variety of writing techniques, grips, degrees of writing pressure, etc. The nib was engineered to take advantage of the proprietary gold alloy, with its unique elasticity and vibration-dampening properties. The shape,continuously varied in thickness, further enhances these properties, while the tipping material adds a measure of reliability. Parker's engineering prowess allows the Janesville company to create a writing surface both smooth and "grippy," a nib tuned to write at the lightest touch, yet taking increased pressure in stride. This nib lays down a consistent XF line of about 0.3 mm (on my paper).
If you have been looking for a beautiful pen that writes the most enjoyable, dependable business cursive, look no further. If you are a lover of modern Japanese nibs, you're in for a real treat. And if you've been trying to take your penmanship to the next level, this pen might be just what your handwriting needs.