Why did this card sell for so much last night

[Pat R]

Ted,

The SC factory 42 OP subjects VS the SC 350/460 Factory 30 seems to be
another T206 mystery but I don't see how a federal regulation had anything
to do with the no prints/non released factory 30 subjects. The 52 SC 350/460
factory 30 subjects include all 46 of the 460 only subjects plus the six super prints,
while all of the no prints/non released factory 30 cards are 350/460 subjects,
If a federal regulation requiring them to add the 42 overprint
to the fact 30 had an effect on what subjects are found with a factory 30 back
I would think the opposite would be true with no 460 subjects found with a
factory 30 back.