Darren,
In regards to this: "Theory--Coupon type 1 (AND TYPE 1 ONLY!) is an "assorted back" of T206."
Obviously since it doesn't have a series/subject designation (ie 150/350/460) we can look at it as assorted if we group it with T206, but here's an interesting note:
All the backs that are assorted say either "assorted," or use the word "assortment" except for EPDG and this one.
Not that this excludes the type 1 coupons from the set, but if the guys on the other side of the argument were smart
they'd use this to their advantage.
Rob