I don’t hear too much about these. Does anyone have experience with them? Thanks!
Using the “search” function provided at the top of the page quickly turned up these and more.
I have a recently purchased D non-tunable which I like very much. However, I tried a tunable D/C set which I didn’t like at all. I found it a bit shrill. The D I have replaced an earlier one which played well but had a much rougher finish. So their is some variation out there. That said, I think the non-tunable ones are WAY underrated and a good value.
thanks for the comments!
I have a non-tuneable D. It looks very much like an Overton, but with a flared bottom and an actual shell casing embedded up top about an inch under the mouthpiece section, reading “Harper Classic.” The maker is said to be a gun smith I believe.
Pretty nice whistle and tone, although not among my every day players.
The tone holes have a bit of a rough sharp finish.
I got mine for about $50 used from a Board member and am satisfied with it. It’s one of those that I consider a must have because it’s both a pretty good player and a uniquely interesting looking whistle.
Oh, it is of the “plain” variety, as there are those made with additional designs.
Philo
I had the ornate engraved C/D set very nice whistle, and very distinctive sound, but very loud especially the top end of the upper octave, the notes throughout have a very resonant ringing tone to them, I mean that in a positive way, not like a tinitus ring, but a very nice punching focused tone, I prefered the C body to the D but the D was a great whistle, I had Steve make me a second head for the C body, very nicely crafted whistles and he charges a lot less than a well know USA/UK music store, if you would like his phone number PM me, he is a great gut to speak to and is very helful.
cheers Sponge 
if you go to kerrywhistles web page Phil plays one in his profiles sections
and Tony Hinnigan plays one on his site, when Tony Plays it you will see what I mean about the tone.