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PCI do not believe the number 12 appears, with any certainty, in any T206 series other than the 460 Only series and the So. Leaguers.
Here's how I look at the first 4 series ...
1st Series / 150 Only -- is it 9 or 12 cards? Or is it 10 or 11? We do not know. But you only get from 9 to 12 cards if you take 3 out of the 150-350 Series.
2nd Series / 150-350 -- is this made up of 141 cards or 144? Or somewhere in between? The issue I have here is that you can't take 3 away from the 150-350 Series and assign them to the 150 Only series, and then assume there must have been three double-prints, just to get back to 144.
3rd Series / 350 Only -- this is at least 208 cards. To get to 216 you have to take the 6 super-prints (which are from the 350/460 series) and then add in the Demmitt & O'Hara St. Louis variations (which only appear with Polar Bear backs). However, if you are going to add the two St. Louis variations, shouldn't the Demmitt NY and O'Hara NY be subtracted? I do not see how Demmitt NY and O'Hara NY could have been printed on the same sheet as the St. Louis/Polar Bear variations. That would be impossible. So, even if you take the 6 super prints from the next series (which is a big assumption), the most you can come up with for any individual 350 Only print run is 214.
4th Series / 350-460 -- this comprised of 61 cards. 55 + the 6 super prints. No matter how you slice it, there's no forcing this series into a multiple of 12.
And if you factor in the overlap among the Series in the print process (150 Only and 150/350, 350 Only and 350/460, etc.), and the fact that not all cards in a series are found with the same backs, then the number 12 really has no significance in the printing process.
I'd be happy with 12 or 19. I just don't see how the 12 card theory can be viewed with more certainty compared to what we actually see in the Obak printing process.