OK, so no flood of very early articles, so far. Time is on our side.....
But, to keep the thread alive, here's an interesting convergence of the earliest hobby pioneers....
Around 1935, the UK hobby of cigarette card collecting was now becoming well-established. The Cigarette Card News was published monthly by the London Cigarette Card Company, with issues starting in 1933.
And, in the USA Jefferson Burdick started writing in Hobbies. His first article (of 8 in Hobbies) was in December 1935. All these articles can be found
here courtesy of Old Cardboard.
Separately, Lionel Carter was writing about baseball cards in Kaw Chief Stamp Journal. An article from 1937 is
here, courtesy of Tom Bobblitt.
In the UK, Collector's Miscellany, October 1935 (
here), managed to include all 3 journals - as shown in the screenshots below. Now what's the odds of that?