There was one instance where I lost an auction on 
a set of those "copy sketches" and the seller 
wrote, offering to make a copy for me before 
sending them to the high bidder. So I have no 
doubt that some of these copy sets are copies 
made outside the studio. Of course, to me (and I 
own very few of these) the only value of the 
copies is to see design details. Sometimes they 
have handwritten notes on them, but this seems to 
be rare.

As I understand it, there *is* only one original 
set. If you think about it, having only one 
original makes sense since it's meant to be used 
as an official reference. . . So you would want 
to make sure that everyone was looking at exactly 
the same thing. I'm sure the number of studio-
made copies would vary by the size of the team 
working on the show in question. 

Many Sharp Smiles,
--Drac