Well, it sure looks like another glaring omission from that Forbes guy - he can't seem to get anything right! I checked my T57's & also have some of the Factory 7, 5th Dist. cards in the second half of the series (51-100) - can't figure out how he missed something as obvious as that.
The second half was issued shortly after the ATC breakup in early 1912. That's the time frame when Factory 7, 5th Dist. starts appearing on cards & silks (it was either a new factory or one renumbered after the breakup). My current theory is that all the cards in the second half were issued from this factory but probably not the first half (1-50).
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