Radio was referencing the special finish of the pens. I suspect "Radio" was a hyped term signifying "modern" and hinting at some kind of ultra-high-tech electro plating process. Kind of like "Atomic" in the 50's and 60's and "i" or "e" before anything today.
The pens themselves are exactly the same as the normal pens but with an extra coating that does seem to have some impact on preventing corrosion.
But knowing that the only difference is the coating makes things like the extraordinary price for an Esterbrook 914 Radio pen crazy when regular 14's are sold at a fraction of the price. This is because it is known that Charles Schultz, creator of Charlie Brown and the Peanuts comic strip, would only draw his strip using a 914 dip pen. He said he would stop drawing his stripshould he ever run out. The story goes that when Esterbrook announced they were going to stop production of all dip pens, he went out and bought every single 914 he could find. There aren't as many of them out there as other Radio pen styles (all begin with "9") and with their association with Schultz, they sell for a stupid price, considering. (like five or more times the price of a regular 14)
Edited by AAAndrew, 10 March 2019 - 20:42.
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