see https://forums.chiffandfipple.com/t/fs-overton-low-d-whistle/72039/1
Anyone interested in an original Bernard Overton low D in good condition?
Make me an offer. I rather sell it here than go through the hassle to put it up on ebay.
PS: if you are looking for tunable Overton low D, I could fit a tuning barrel to this whistle.
another one on Ebay too
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120604691282