A Nowegian Duo played at the local folk club. One played an old D Feadog. It was a dream whistle. Pure and spot on each note. We commented on it and he said that it was because it was a very old one and would have been made carefully 50 years ago the sounds was good. All his others were Shaws and old ones too. Inspired me to get my modern C Feadog out but what a cacophony. I don’t know if I even want to try to tweak it as it sounds so bad to me. This Duo was good. They played and sang Irish, Scottish,English and Norwegian folk songs and finished with Flower of Scotland in Norwegian and Scots. The free for all session at the end was great as we just all jammed. Haven’t had so much fun in a long long time. 
How long have Feadóg whistles been made?
I had a Feadog D back in the early 70’s that I really enjoyed playing. I think that name may have been owned by a different company then. It was brass with a green fipple. It was my very first whistle.
But I have a perfect memory. I forget everything, so that may be wrong..
I am sure it was my first whistle, though.
Yes. This was brass and with a green fipple and no name on it. I tried to tweak my C feadog today but it still sounds bad. 
When did you buy the C? I just bought a D Feadog about a month ago and it sounds fine. Maybe something has changed. …
Little John
There are lots of different versions of Feadóg whistles out there.
That is the kind of profound post that elevates what could be a pedestrian internet board to a poststructural tinwhistle experience.
And by the way:
In my experience you have play a cheap whistle a lot before it sounds good.
I have a brass Feadog with a green fipple–it was my first whistle, too. I bought it in Dublin in the 80s. It had a transparent tape with the word Feadog on it wrapped around it, but that long since has come off. The mouthpiece is cracked and my daughter’s baby teeth marks show clearly. I’ve lost it and found it several times, not just around the house. It now has Tommy Peoples’ autograph on the back of it, taped over with scotch tape to keep the green ink from being rubbed off. The area around the fingerholes is worn and dull, and there are scratches and other worn patches all around it. It has a very sweet, breathy sound and is my favorite cheap whistle. I’ve never played a Generation that has come close to this one for its character and sweetness.
Carol
I have a Feadog from the 70s too. Its never been the same since I loosened the headjoint for tuning. It was my favorite cheapo and the one I learned to whistle on. Physically, sounds like the one Carol described. I think its a MK 1 right?