Is there anything other than the fins that make you think Honest John?
By the way - I did finally figure out the odd looking Terrier fins on the T-Improved Malemute and T-Orion. There's a 4.8 square foot terrier fin. I finally found a picture with enough resolution to blow up and read the manufacture's decal - complete with website.
While I don't believe its is an Exos (the payload section looks wrong, but it still could be), here is a link to a document I found on the original PWN-4/Exos.
https://deepblue.lib.umich.edu/handle/2027.42/5372
Congrats on locating that data . . . Can you post the pic ?
Not an Exos. In fact, that whole "third stage" is no simple solid rocket stage. Looks to me like an Honest John-Nike with a complex payload that may or not include a third rocket motor. I have not encountered this beast anywhere, so I can only speculate.
From the several reports available online the vehicles were simply named "A", "B","C", etc....
Combinations included HoJo-Nike and HoJo- (Castor) Lance.
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