Next up in my Esterbrook nib list is the Esterbrook #9788 Flexible Medium nib. Like all 9xxx series nibs it’s one of the nibs Esterbrook called a “Master DuraCrome Nib.” It’s osmiridium tipped. Osmiridium is what Esterbrook called the tipping material although it’s probably mostly iridium. At that time osmiridium wasn’t clearly defined and was an alloy of different metals. Iridium was one of those materials although there wasn’t any standard for the mix of metals.
Esterbrook promoted the pen as being for “shaded writing”, at least on nib charts from the 1950s. The box I have is labeled both “Flexible Medium” and “Shaded Writing.”
There is some flex in the nib, as the name implies. I’m not proficient at using flexible nibs so I’m not the best judge, so take this for what it’s worth. It’s a steel nib so there’s not a great deal of flex. The tines do spread with pressure and variation in line width is possible. Ink flow is excellent and I didn’t have any problems when flexing the nib. I also found the nib enjoyable to use normally (no flex). I’d pick it over the #9668 that I have. There’s slightly more ink flow and I like the line better. Of course, I may say the opposite with a wetter, more free flowing ink.
My particular nib has the final feed design and the Esterbrook name and nib number are engraved the length of the nib. Aesthetically I prefer this lengthwise engraving over engraving across the nib.
My particular nib was an eBay purchase and was new-old-stock (NOS) and arrived with the box. Prices seemed to have spiked since I got my nib. I found current eBay buy it now prices of $75. Anderson Pens prices the nib at $45 but it’s out of stock.
As I also said with the #9688 nib, the #9788 is a very nice medium. I’d pick the #9788 over the #9688 if price wasn’t considered. With the Esterbrook #9788 currently selling for five times the #9688 I’d be hard pressed to justify it’s purchase unless my skills with flex nibs dramatically improve. I’d also think skilled flex writers could do better with some other vintage flex pen for about the same money. So my Esterbrook #9788 Flexible Medium is a keeper, but not one I’d replace if it’s lost or damaged.
This is the last of my Esterbrook nibs, so the last nib notes. At least until I find some more. You can find all the, nibs and links to their nib notes on my Esterbrook Nibs accumulation page.