Actually, this entire theme has been a red herring, prompted by this bizarre description of this sabre with stag horn grip being termed a 'shashka'.
This blade is probably as Ariel has noted, an Indian tulwar blade (if indeed with blunt ricasso) or otherwise as he also notes, a European (likely German) trade blade.
The fullering seems comparable to many German sabre blades of late 18th, but the use of the staghorn is most atypical, and agree that it seems most innovative. Use of the 'shashka' term most creative
.