The Japanese 11th Army /第十一軍戰/ was formed on July 4, 1938 under the Japanese Central China Area Army for the task of conquering and occupying the central provinces of China between the Yangtze River and the Yellow River. The 11th Army played a major role in the Battle of Wuhan. From September 1939, it came under the newly formed China Expeditionary Army and was transferred to the control of the Japanese Sixth Area Army in September 1944. It was disbanded at Quanzhou County (Guilin) in Guangxi province at the surrender of Japan.
Long service badges of 11th army could be found here https://asiamedals.info/threads/11th-army-long-service-badge.23370/
1st type.
Size 33 mm.
Reverse
第十一軍 - 11th Army
Long service badges of 11th army could be found here https://asiamedals.info/threads/11th-army-long-service-badge.23370/
1st type.
Size 33 mm.
Reverse
第十一軍 - 11th Army