http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=7307749943&ssPageName=STRK:MEWA:IT
From the listing:
“You are bidding on a whistle set c/d, made by Steve Harper of England . This whistle set is aluminum alloy, cylindrical, engraved, tunable. I am original owner,approximately 4 years old,excellent condition( a few small surface sctratches).”