I started this a little backwards to read about the pluto platters I did the newest to oldest starting from here, It could be helpful to start from the bottom of this page and work your way back up, this way you will see the mold retoolings in order of when they happened, to see my American Trends Pluto Platters look under Antiques
Looking for hard to find styles leads to trying to ID used discs, so I asked the expert Phil Kennedy. Here is a pic of a emailed photo from Phil that IDs this one as a 6th style. Here you see a green circle highlighting the mold flaw found on the ejector pin area, this can be found in many different positions because the ejector pin area on the mold can be moved but the # 1 is always in the same spot in reference to the Backwards # 1, what we are looking for is any sign of a backwards # 1 , no # 1 here this is a rare 6th style!
Wham-o took Fred Morrison's American Trends Pluto Platter and mass produced them between 1957-1964, retooled 7 times and even a experimental rubbery plastic on the last run, on these different from the American Trends Pluto Platters there is the word Wham-o 1 time on top of the disc and a esker on the underside, these are all the colors for the 1st style, white is rare!