Upon interrogation, it revealed it's true identity:
IBM Personal System/2 Space Saving Keyboard P/N 1392934 born on 14th January of 1992, two days late for it's 23rd birthday. Tape was still intact! Promptly an operating table was set up and the outer shell removed to reveal the protective insides! And..here it is! It was flipped to show it's label The label is covered in plastic film, presumably to protect the sensitive label underneath!
The underside shows some casting irregularities but no big deal! While turning it, I heard some noises inside, so out came the "Model M Violator"... And the DIY "Metal stuff Retriever" After it's shell is removed the problem becomes apparent: (look at the membrane connector and below right Alt)
Innards removed and rivets poked with fingernail, and the result is this: Half were already off and the rest needed just the slightest of touches...
The back of the plate clearly shows the distribution: Funnily enough, the middle ones are intact although they are under way more stress than the others.
And even more funny, the keyboard works fine...keys are not as crisp as they could be, but still...
I am typing on it right now...27 rivets missing vs 22-23 remaining and it just won't die...

I forgot to show it's little pet snake: NIB coiled goodness!
All in all I am really happy with it!