Hello Valerii,
Many thanks for your post, I found the Legitymacja on the internet back in 2018, I can not remember from which website I got the Legitymacja from, sorry that I can not be of more help to his Granddaughter.
The only other information that I can add is : Rank : Strz. Date of Birth : 1st January 1919, Army Number : 1919-103-III, Unit : 13BS, 5KDP.
Information from the Index of Victims of soviet Repression website.
Best wishes
Andrzej
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