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I found this one on the bay, got it cheap.
Ebay pic:
Hmmm
Minus connection almost rotten away, the module kinda works, but dies after pressing the light button, not enough current flowing through the slivers of remaining metal. Multi layer ceramic circuit board!
Some fiddling with a circuit writer pen. (messy sorry
)
Other side:
Allright, power issues sorted, now the missing segments. It turned out the metal fiddly bits up and under the lower lcd clamp were in the wrong order. So:
That went well
So I decided that I as well could see if I could clean the other Citizen I had for years, somewhere in a parts box. It also has a ceramic circuit
It was filled with peanut butter like battery acid, but it went well 
It even has a leap year setting!
Allright next....
Ebay pic:

Hmmm

Minus connection almost rotten away, the module kinda works, but dies after pressing the light button, not enough current flowing through the slivers of remaining metal. Multi layer ceramic circuit board!

Some fiddling with a circuit writer pen. (messy sorry

Other side:

Allright, power issues sorted, now the missing segments. It turned out the metal fiddly bits up and under the lower lcd clamp were in the wrong order. So:

That went well
It even has a leap year setting!

Allright next....