To respond to the OP's query, I have had excellent experience with Martin Ferguson of Martin's Pens. I don't think he's been mentioned in this thread yet, but I'm sure many folks here are familiar with his work, especially since he's a regular at many of the US pen shows. He restored two Parker Vacumatics and a Sheaffer Snorkel for me a couple of years ago and I was very impressed. He explained every step of the restoration to me, let me watch him work on my pens, and seemed very interested in teaching his skills to a new generation. He's very familiar with Parker pens, and if you've got a vintage Duofold, which I think the OP mentioned, that needs to be restored, I wouldn't hesitate to send it to Martin. I've also bought a couple of vintage pens from his table and they were all in perfect order. I've only interacted with him at pen shows, though, so I have no idea what his turnaround time is.
I've also used the services of (and have been very happy with): Joel Hamilton (he replaced the seal on one of my vintage Montblanc piston fillers); Ron Zorn (he resacced a bunch of Esterbrooks for me when I was new to fountain pens and didn't yet know how to do it myself); John Mottishaw (who I often recommend for nib work but who also does top-notch repairs and fixed my Omas's broken piston); and Gerry Berg (he restored my Sheaffer Tucky's shot plunger filler).
For nib work, all of my pens go to either Michael Masuyama or John Mottishaw.
I know there are many others out there who do very good work, but these are the folks who I've had first-hand experience with and who I trust with my most cherished pens and who I wouldn't hesitate to recommend to others.
(By the way, I am not affiliated with any pen business. I am only a satisfied customer of the above-mentioned folks.)
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