These are collar tabs used by the National Socialist Motor Corps (NSKK). The NSKK was a paramilitary organization of the Nazi Party focused on motorized transport and training. The tabs are a standard NSKK officer insignia pattern. The presence of three silver pips indicates rank of Sturmführer. The number denotes the specific NSKK unit or motorized regiment to which the wearer belonged. This is a matching pair that is uniform removed.