Help identifying a 1940s (?) Longines

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Any attempt to clean the dial has risk that you will damage it further.


The “dots” are remainders of tiny chemical reactions between the dial base metal and moisture that made it inside the case and through cracks in the natural lacquer used to seal the paint on the dial.

It may be possible to have a watchmaker run a soft brush over the dial to remove any loose dust or dirt. Only you and your watchmaker can determine the appropriate treatment if any.

Hope this helps,
gatorcpa
Helps massively! Thank you again for sharing your knowledge and expert advice
 
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Ah yes they are! Is that a feature or something that needs to be fixed??
It is a feature. It suggests that the case was manufactured by pressing and folding a flat piece of metal into the shape of a case. Many Longines cases from the period were made this way.

Regarding "tampering" with the dial, I really meant any attempt at cleaning it. As @gatorcpa mentioned, there is always a risk that the cleaning process will result in a dial that looks worse. I would recommend leaving the dial alone.