The earliest posters were first issued in the late 1970s. Nike's Peter Moore, was responsible for creating the layouts back then with the assistance of Seattle-based photographer Chuck Kuhn. We have dated several of these by their presence in the Smithsonian's Cooper Hewitt collection.
[ https://www.sneakerfreaker.com/features/the-man-behind-the-jumpman-chuck-kuhn-interview ]
Based on this input, our assumption is that these posters were not originally ( in the late 1970s ) given the 6 digit 290XXX numbers until the decision was made to sell them as a product and the need arose to display them on countertops in stores. Then the posters already in existence were given a catalog number and the "poster cards" were invented and distributed for advertising purpose we already discussed. This happened around 1982/83 . The order form that was available in 1985 ( per Bruce Fisher) is shown below.
290201 Supreme Court 1982/83
|The Hewett collection (see ref below) dates the poster as 1977-79. We believe this was the first poster issued for sale to the public by the NIKE poster business in late 1982|
Enshrined in the Smithsonian, this poster features members of Nike’s Pro Club, a group of Nike-endorsing NBA players, wearing long, black judges' robes. Note they are all wearing white sneakers with the NIKE swosh. From left to right this group includes: Phil Chenier, Campy Russell, Dennis "DJ" Johnson, Truck Robinson, Lionell Hollins, Elvin Hayes, John Drew, Artis Gillmore, Phil Smith, Bernard King, Gus Williams, Alvin Adams, Calvin Murphy, George "Iceman" Gervin, Paul Westphal, Maurice Lucas, Austin Carr