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My friend helped me to understand the text. I think it stands as: Fest. Pi. Abschn. Gr. II/16
That is, (Festungs-Pionier-Abschnitts-Gruppe II/16)
the translation group 2, the serfs of engineering parts.
I think it's out of 16 Panzer Division, which fought at Stalingrad.
And You?
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