Good explanation for this thread's completeness. I had mentioned the plate number requirements in my first post, 21491 and 21493.
In my post with the photos from eBay
, I pointed out that one 1b was actually a 1a. I did not point out the plate 21494 listed as a 1b did not belong as any 1a, 1b or 1c but that did not stop it from being listed by the seller as such. I was wondering if someone would see and comment on that.
Not just on CE-2, but in many cases, "experimental" equals "hard to find." So you have some 1b options, but your search for 1c may take longer. However now, you will be able to recognize it when you see it. Good luck.
That is the upside for owning the book. The downside is the book may give you ideas for other hard to find goodies.