I've owned all of the ad backs at one point or another and have a couple in my current collection. I estimate that altogether there are about 1000 T216s. Probably all fronts were printed with all backs, but I think it's very unlikely that a master set is possible, given how poorly the thin ones have survived. The vast majority of the 300 or so surviving ones are in poor (or "authentic") condition.
The rarity ordering mentioned above is correct, and the two thin paper types are usually a bargain relative to their total numbers.
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