Was looking at maybe a Burke, either in brass, possibly aluminum.
I play a Burke B natural in brass. It's the only commercially made B natural I have owned for the last five years. It gets a lot of use. It's a very good whistle, no complaints. But then again I own/play a couple dozen Burkes. And, just my opinion but, the brass and aluminum Burke whistles play equally well and sound quite similar from ten feet away. If you like a light weight whistle go aluminum. If you prefer something more stout, go with the brass.
I owned/played a Susato Kildare B natural before that. Good stuff.
Then again some players have converted Generation Bb whistles to play in B natural. It's not difficult work either. A search through the forums (both pipes and whistle) should lead you to an outline of the procedure. Here's what I have found from previous posts on the same question as your own.
pancelticpiper on Tue Feb 05, 2008 5:36 am wrote:
I made my own from a B flat Generation. It plays great.
Take the head off a Generation B flat, and chop the top of the tube until the upper-hand notes are in tune to the B scale:
xoo ooo is G sharp
xxo ooo is F sharp
Then chop the bottom until it plays an in-tune B.
Then carve out the lowest tone hole until it plays an in-tune C sharp.
Then carve out the next-lowest hole until it plays an in-tune D sharp.
And Bob's Your Uncle!
And for a little more detail there is this:
billh on Wed Apr 19, 2006 2:53 pm wrote:
An inexpensive alternative worth trying:
As it happens, you can take a Bflat Generation and remove metal from both the top and bottom so that the top note is sharpened a semitone and the bottom note (all holes closed) is also sharpened a semitone. By some weird quirk of Generation's tuning, the resulting notes in the middle are well within range as well, and the resulting scale is an acceptable B scale. At least, it works for me.
Total length of the doctored Generation (metal part, without fipple):
Distance from the top end of the whistle to the top hole:
(Of course you know you can tune Generations by removing the fipple, if yours is stuck, try soaking it in hot water for a few minutes, it should let go).
Hope that helps.