A busy KIPP week after receiving a small catalog of the 1962 Parsons show, I happened to see an email from KIPP collector, Beau Ott, with some data corrections and updates - including an article dating BADGE. This led to a new general web search and I located imagery at the Smithsonian of TAU and FLUX.
BADGE and PLUMB appear to be the first examples of the bolted plates era.
Always exciting to find more information after all these years.