RARE Corelle fruit pattern plates

Set of 5 fruit themed plates that I cannot find any information about. These are 8 1/2" with each plate having a different fruit decal. Having worked many years for Corelle as a Quality Associate, my opinion is these are from the 60s and might have been made for a trade show. In 2002, I got to see new ware being made for a show and it was all hush hush. No one was allowed in the room they were being made in etc. They only made about 10 of each new design for these shows and I only got to see this process because of testing I had to do as part of my quality procedure. The new design dishes did not have a trademark stamp put on the dishes. My opinion is just that, an educated guess as I cannot confirm anything. Also, I picked these up at estate sale in Corning in an upscale area so my guess is the deceased husband might have had something to do with the design (engineer). These do not appear to have been used.