This is an Imperial German Artillery Officer's Saber - artillery is indicated by the "crossed cannons" on the crossguard langets (the ears that extend downward over the blade flat or ricasso). These are considered Imperial German - beginning about 1890 - but were used in several branches of the German Army through WWII. Nazi Third Reich specimens are similar, but will display the "eagle and swastika" emblazoned on the cross-guard langets.
You can usually find the manufacturer's name on the blade ricasso (the blade flat near the crossguard), hidden by these langets.
This particular example bears the maker's mark "back-to-back squirrels over CE" - the logo for Carl Eickhorn & Company of Solingen, Germany. This particular logo helps to date the sword between 1906 and 1921. So it is most likely Imperial German, although it could be early Weimar Republic. This would suggest - by process of elimination - that you could rule out Third Reich Nazi era. Since artillery was attached to cavalry, you can assume that this was a mounted officer's sword; very likely Prussian.
Hilt is constructed of gilt brass, P-guard; lion-head pommel; grip is leather with decorative wire wrap.
Single-edged blade, single fuller on both sides.
Scabbards are sheet-rolled steel, single hanger ring, all black enameled.