What would you experts out there make of this Longines?

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If it's not Kosher it would fool me. To me it looks great. However I'm no Longines expert. I bet Syrte will know.
Grateful for the nod but I have not studied those 1950s/60s designs. I would have found it beautiful except for the schrewd comments above noting the caseback appears to have been ground down.
 
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The dial and hands are perfectly correct, and a nice variation.