The disc you posted here is a nice one- and it fits incredibly with the transparent plotting layover sheet; Bb25 refers to Beobachtungs-Abteilung 25- they were artillery observers so used such things as the layover sheet on maps for plotting positions on maps to call in artillery fire. The unit is listed as destroyed in Stalingrad 15.1.1943 with the 305. Infanterie-Division.
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