Vintage Longines case

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Someone locally was offered me this for sale today (extremely ambitious price ).
Similar dial configuration as one of the above, but slightly different
They look beautiful, despite the radioactive corrosion of the numbers on the dial.
Have you purchased them?
 
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I believe a caliber 12.68z would most probably the one for that case...
Hello! Following your advice, I was looking for 12.68z and finally found it.
Among many inadequate sellers (offering a non-working mechanism for $1,500, for example), I managed to find an offer for only $60.
So all that remains is to find a dial. (I'll pick the hands from my stock, I hope.)
I just don't understand, does the number start with 6 or 8... If it's the 8 millionth, then it's already from the 50s, it doesn't really match. But I have to choose from what I have.

 
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funny fact. In the spare parts with which the seller sent me this Longines case, there was also a dial. I tried it on for fun and it fit the movement. But strangely enough, it is not from this case))) it is larger than necessary in diameter and does not fit)