I can't answer the unit designation, but the insignia on the side of the handle is exactly the same as used by the 13th Uhlans. ". In 1889 Kaiser Wilhelm II was declared the Regimental Chief of the "Ist Hannoverschen Ulanen-Regiment No. 13" which, on the same day, was re-titled "Konigs-Ulanen-Regiment (1 Hannoversches) No. 13".
Neil