No doubt they are likely a "custom SD" head that were designed just for Mickey, or he actually requested Pontiac to cast them up in that fashion. There was a lot of interesting stuff going on with the SD program of the early 60's, some of it "under the radar". I imagine the Heck's or perhaps Tom Slauch can shed more light on what these heads were. Looking at that picture, I'd guess it was shot in '60 or '61.
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