The Westphalian pieces were never used as notgeld though. They were basically fundraisers. But for collectors, the word "Billion" (a German Billion is a US trillion) on a coin may well be appealing.
And yes, those Turkish pieces are CuNi. At that time, shortly before the Jan-2005 currency reform, they even had silver commems with a face value of 20,000,000 (old) lira ...
Christian