As no one seems to have worked it out, here is the answer:

They are the Star Collection from Bohm http://www.keyswerk.de/de/produkte/star_collection/demos.htm and will work in all Bohn instruments including the “Silverbird”

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).