Pre WW2 issue of a Luftwaffe "Geschoente" Tuchrock for the driver in FLAK Abteilung in rank of Obergefreiter

Pre WW2 issue of a Luftwaffe "Geschoente" Tuchrock for the driver in FLAK Abteilung in rank of Obergefreiter. Shortened tunic as a fashion or for a better fit to drive the car. All the insignia is original to the tunic, but probably the eagle is replaced, we are not sure about it. The markings on the liner: size Luftwaffe Bekleidungsamt LBA (S) 37, and re-approval of LBA 38, probably the tunic is shortened by depot., producer stamp UNIFORMFABRIK ERLANGEN and another producer or unit markings Bkl.L. Brunn a G. The tunic is in good size approx 50 opean