I've had this Super 21 for a couple of years now and only today did I notice three little letters on the filler to the left of where it says "The Parker Pen Company" and "Made in U.S.A." I checked Richard Binder's site, but didn't find any mention of this on the 21 page or the 51 page. I don't think I've ever seen this mentioned in any discussion I've read. I tried a Google search, but it's hard to get useful results when you're not sure what search terms to use. Can anyone tell me what "DFA" might mean?
Seriously though, thats a new one on me as well. It's in a different size & font of the Parker imprint. I wonder if it could it possibly be a very subtle personal engraving?
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Tu ne cede malis sed contra audentior ito ~Yield not to misfortunes, but advance all the more boldly against them