Very nice poster Mike! I know little about the set as well. I do have the back that came with the set (blank and thicker card stock). Like yours, mine are cut with what looks like scissors in some locations.
I have one edge on the White panel that has an edge that looks like an OPC variety
Three of my panels are handcut on the bottom of the panel, and the Hamilton/Talbot/White panel is handcut on the top.
Very interesting about the 68 yearbook and poster! I take it the magazine does not reference the artist of the sketches anywhere? Curious if Michas was an artist too?
I have not found any additional info other than the two sources you mention for the set. Would love to find…
This is a pic from the Beckett Vintage Almanac of the set too (same info you found online).
