Photo postcard with inter-war photo of 84th infantry regiment on parade. Writing on back has name, regiment, town and date of 10.7.26
There is an X on the photo over one soldier, who may be the one sending the card (?).
I don't read german, so some decoding would add more info to what this picture depicts.
Flags appears to be that of the IX Corps of the Imperial Army (veterans?). There was an 84th (Schleswig) Infantry "von Manstein" regiment.
9 x 13.5 cm
(Red text is an electronic watermark that is not physically part of the photo for sale)
The IX Army Corps / IX AK (German: IX. Armee-Korps) was a corps level command of the Prussian and German Armies before and during World War I. IX Corps was one of three formed in the aftermath of the Austro-Prussian War (the others being X Corps and XI Corps). The Corps was formed in October 1866 with headquarters in Altona. The catchment area included the newly annexed Province of Schleswig-Holstein, the Grand Duchies of Mecklenburg-Schwerin and Mecklenburg-Strelitz and the Hanseatic cities of Lübeck, Hamburg and Bremen. The Corps was assigned to the III Army Inspectorate but joined the 1st Army at the start of the First World War. It was still in existence at the end of the war. The Corps was disbanded with the demobilisation of the German Army after World War I.