07-22-2016 08:02 PM
The bottom tag is probably for equipment or a tool case. The 8161 is the field post number for:
Field post stamps 1939-1945: 8161
User: Post Office | Use as: task stamp, date stamp 28.4.1940 14.9.1940 Staff reserve anti-aircraft Division 444. 15.9.1940 31.1.1941 Staff 11 flak-Regiment of 44. 12.7.1941-26.1.1942 Sta heavy flak battalion 477, 11.9.1943 Rod heavy flak battalion 472 o
Type: K1 (circle a round stamp) / shape: Circle stamp
Use time: 28.4.1940 to 21.5.1945
The top disk (as far as I can tell) is:
Oberbefehlshaber der Luftwaffe - 5. Abteilung Fremde Staaten
Not sure what this group did exactly but it is the "5/Oberbefehlshaber der Luftwaffe" technically.
Middle disk is "Schwadron Ersatz und Ausbildung Battalion 36" Squadron Replacement and training Battalion 36. Unfortunately I cannot find any reference to that unit.
Many thanks for the answers.