There are 3 of these, apparently different models, that have been corrected to 440 and refurbished. I’ve seen these crop up before on eBay. From the photographs, they look as if they have never been touched by time…as if they came right out of the factory. Are they for real?
Oh, and speaking of physics, how exactly do you correctly adjust from 435 to 440 without lengthening the flute and building up the tone holes from the top? Seems like a lot of work.
Some of these later French flutes were painted with shellac. They look like new after all these years, save the discoloration at the finger holes.
Usually you modify the tuning by shortening the foot at the socket, and adjusting the tone holes.
I bought one from them a while back - it was an ivory-headed non-labeled Nach Meyer. It was pretty nice for the price and played OK. The repair in the ivory was starting to look a little iffy when I re-sold it, but it would probably last for years without another repair. I was very tense about dealing with an instrument from Poland off eBay, but I had a good experience. I got mine real cheap, though, before the prices started going up!
Pat
I’ve seen this type of question for years. You can either buy a bunch of inexpensive mediocre instruments and have a bunch of inexpensive mediocre instruments or spend a thousand bucks plus and have one great flute. The choice is yours. I’m feeling the ole swine flu and that’s why I’m writing instead of blowing. Sorry for the cracky tone but geez people just play whatever you got and get on with the music.
this flute was restored by guy name Grzegorz Tomaszewicz. He lives in Warsaw and fixes, makes flutes, recorders and other instruments of that type - he specialize in baroque and reinesance flutes. but I saw his flute in D made in maple of black oak and they were absolutely brilliant.
send him a message if you have any questions - he’s a profecional and a really good guy 
So why do the eBay adverts say the flutes were re-tuned “in England”?
Perhaps its that air pressure and 440 isn’t the same in Poland. 
I’m reluctant to believe any much of this without a rather complete explanation as to what was done and why.
I own a couple of these flutes and have played others. While they are certainly playable I wouldn’t call them session ready nor would I dare call them “Irish” flutes even “re-tuned”.