Omega Federation Horlogère/Sparkle?

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This just popped up on ebay:

s-l1600.jpg

...and then there's this 'prototype' on Chrono24:

19135287-3uzz7yppafmzjqd902y39j6l-Zoom.jpg

...and then there's this, from @watchairy:

ewHXVWS.jpg


All three have different casebacks, so it's not all the same watch. I'm presuming, based on the thread re @watchairy watch, that these were student watches, used in the early 1970s to test students, but I'm curious if anyone has more info. Just fascinated.
 
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Also interesting that it doesn't have a cal. 751/752 in it.
 
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Agreed; they seem all to be 1012s, at least the ones shown. I'm fascinated but totally confused.