I should clarify that I use "probably" in this case as more of a specific term. As far as what can be proven, it's maybe more than 90% certain. There's proof that some T206s were printed from stones. (A card where there's a recurring inked nail impression that can only have come from a nail embedded in one of the rollers of the right sort of press.)
BUT ALC worked closely with RS Hoe the press manufacturer and the years around 1910 saw a number of changes and developments including offset lithography from metal plates becoming more common, as were presses that printed multiple colors and ones that printed from a roll of stock rather than sheets. So it's not impossible that some were done by those other methods.
Steve B
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