Aerometric vs Vacumatic: Which Parker 51 Is Right for You?

Hey there, pen lovers! Are you trying to decide between a Parker 51 Aerometric or Vacumatic? Don’t worry, we’ve got you covered. We’ll break down the differences between these two classic pens and help you make an informed decision. You might even learn a thing or two about the history of these bad boys along the way. Let’s get started!

The main difference between the Parker 51 Aerometric and Vacumatic is the filling mechanism: the Aerometric version uses a plunger-style filler, while the Vacumatic uses a diaphragm filler. Both versions have a sleek, streamlined design and are known for their smooth writing experience.

Hey there, are you still with us? Good, because we’ve got plenty more to share about the Aerometric and Vacumatic versions of the Parker 51. Trust us, you don’t want to miss out on all the juicy details. So go ahead and keep reading. We promise it’ll be worth it.

History of The Parker 51

Alright, let’s dive into the history of the Parker 51. This pen was released in 1941 and quickly gained popularity due to its sleek design and innovative filling mechanism. It was named the “51” because it was the 51st design created by the Parker Pen Company, and it became known as the “World’s Most Wanted Pen” due to its widespread success. The Parker 51 was the first pen to be made with the then-new plastic called Lucite, and it was also the first pen to feature a hooded nib, which helped to protect the ink from drying out. The Parker 51 was produced until 1972 and remains a highly sought-after collector’s item to this day.

Blue Parker 51 with open cap

Differences Between the Aerometric and Vacumatic Versions

Okay, so now that we’ve got some background on the Parker 51, let’s talk about the main differences between the Aerometric and Vacumatic versions.

First up, let’s talk about the filling mechanisms. The Aerometric version uses a plunger-style filler located at the back of the pen, and you simply press the plunger down to fill the pen, drawing ink into the reservoir. On the other hand, the Vacumatic version uses a diaphragm filler located under a blind cap at the back of the pen. To fill the pen, you depress a small button, which expands the diaphragm and draws ink into the reservoir.

Blue Parker 51 with open cap and vacumatic filling mechanism

In terms of appearance and design, the Aerometric and Vacumatic versions of the Parker 51 are quite similar. Both have a sleek, streamlined design with a hooded nib and a flat top. However, there are some subtle differences between the two. For example, the Aerometric version has a slightly more rounded barrel, while the Vacumatic has a more tapered barrel. The Aerometric also has a silver-colored clip and nib, while the Vacumatic has a gold-colored clip and nib.

Now, let’s talk about the pros and cons of each version. One advantage of the Aerometric version is that it’s generally easier to fill, thanks to the plunger-style filler, and it’s also less prone to leaks and other issues. On the other hand, the Vacumatic has a slightly larger ink capacity, thanks to its diaphragm filler. It also has a more vintage look and feel, which may appeal to some collectors.

In terms of downsides, the Aerometric can be a bit prone to ink evaporation, especially if the pen is not used frequently. The Vacumatic, on the other hand, can be a bit more finicky to fill and may require more maintenance to keep it in good working order.

So, as you can see, there are pros and cons to both versions of the Parker 51. Ultimately, your best choice will depend on your personal preferences and needs.

Blue Parker 51 with closed cap

Writing Experience of The Parker 51

Now let’s talk about the writing experience of the Parker 51. Whether you opt for the Aerometric or Vacumatic version, you can expect a smooth, effortless writing experience with this pen. The hooded nib helps to prevent ink from skipping or feathering, and the pen’s balanced weight and comfortable grip make it a pleasure to write with. The Parker 51 is also known for its exceptional ink flow, with the ink flowing consistently from the nib without any hard starts or stops. Overall, the Parker 51 is a reliable and enjoyable pen to write with, and its classic design makes it a stylish choice for any occasion.


Well, there you have it! We’ve covered the main differences between the Parker 51 Aerometric and Vacumatic, as well as a little bit of their history and the writing experience they offer. We hope this has helped you decide which version of the Parker 51 best fits you. Whether you choose the plunger-style filling mechanism of the Aerometric or the diaphragm filler of the Vacumatic, you can’t go wrong with this classic pen. Happy writing!

Bonus: Maintenance and Repair of The Parker 51

Before we wrap things up, let’s talk about maintenance and repair for the Parker 51. Proper cleaning and maintenance can help ensure that your pen performs at its best for years to come. To clean the pen, simply flush it with cool water and gently blot it dry with a soft cloth. For deeper cleaning, you can use a cleaning solution specifically designed for fountain pens. As for repair, it’s always a good idea to have a trusted professional handle any repairs your pen may need. However, if you’re feeling handy and want to try your hand at repairing the pen yourself, plenty of online resources can guide you through the process. Just make sure to exercise caution and take the necessary precautions to avoid damaging the pen further. And there you have a few tips to keep your Parker 51 in top shape!


My name is Jaap, and I am a passionate collector of pens and stationery. I am excited to share my knowledge and love of this hobby with you through my website. From fountain pens to notebooks, I strive to provide in-depth reviews and information on all things stationery. Whether you're a student looking for the perfect notebook, or an artist searching for the ideal sketchpad, I am here to guide you through the process of finding the perfect items to suit your needs. Join me on my journey of exploring and documenting all things pen and stationery.

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