An amazing sabre, really interesting...Few facts and last but not least, my humble opinion:
The RECTE FACIENDO NEMINEM TIMEAS (or in some cases “TIMEO”) is an old medieval and Christian knightly motto and it translates : “By doing right, shall fear no one”. A variation is also RECTE FACIENDO SECURUS meaning : "Safe, by doing right"
The sword of general Adam Albrecht Neipperg (early 1800’s) from Glauco Lombardi Museum in Parma, Italy, bears the exact same motto. It is not the only one, of course... Otherwise, it is too vague in usage, since it was used anywhere from England to Russia in varied times, from family crests to blades and money. In general it is to be observed in the German world more than anywhere else including the old thaler (old coin, the grandfather of dollar) at the very end of 16th, early 17th century ). See this example:
http://www.cgb.fr/monnaies/vso/v11/i...tml?depart=872
In my opinion, much like the rest, I believe the grip is a later addition, by the use of a Caucasian (possibly a Christian Georgian, Armenian) or maybe a Cossack. The trade or trophy blade is probably Polish, between 150 and 300 yeas old, INMHO.