And here is something fun.
Grenadier-Regt. Königin Olga (1.Württembergisches) Nr.119
(Stuttgart) XIII Armee Korps
Stuttgart photograher studio portrait of young Grenadier in M1910 Garde tunic from Württemberg Infantry Regiment 119 "Queen Olga" with fine detail of crowned "O" cypher on the rare red wool piped Gurtband (woven erstaz cloth) 1915 wartime shoulder strap. This type strap was only used by the XIII Army Corp and only for a short while in 1915. Württemberg cockade on private purchase feldgrau visor cap. Variant insignia on the M1910 tunic in that the 150 m collar white linen Litzen are used and no Litzen on the Swedish cuffs as is commly encountered with GR 119.