Hello Georges, and may I also welcome you to the forum.
Based on the pictures I see no reason to doubt that your cross is a genuine government issue Krupski i Matulewicz contract cross. A wonderful surviving example in exceptional condition. The pre-WW2 ribbon is always a nice bonus!
From what you have written it's quite obvious that you have a sincere appreciation for the history these items represent. These treasures have fallen into the right hands!
Regards,
Tony
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