This might be the strangest sword I have ever seen so far... OK, to say ever can be a bit of exaggeration, but it is definitely true for this year. It could be the top nominee for the Strangest Sword of the Year award.
I have found a short description of this item, and fours photos at an auction site  while searching for Chinese jians sword of Qin dynasty. So it is fair to classify it as a completely random find!
The description from the auction site provides us with the following: „Lot 34 A RARE EAST EUROPEAN SWORD HUNGARIAN OR POLISH SECOND HALF OF THE 17TH CENTURY Broad flat double-edged blade with rebated tip the lower half etched on both sides with an heraldic crest surmounting a classical portrait bust and a Latin inscription differing over the respective sides with iron crosspiece formed with button tips and upper and lower langets flat beak-shaped cap-pommel canted downwards at its front original grip bound with leather over cords and the blade tang secured by a lateral rivet on iron rosette washers.
Overall length is 37.5 inches, 95 cm, blade: 32 ? inches (83 cm).
Very good condition. Blade has a chip towards the tip and minors scratches”
So what we have here? Basically a strange mixture of features:
- a straight broad blade;
- which is double edged;
- and without a tip (rebated);
- a very recognizable sabre hilt (a long crosspiece, langets etc).
Also there is a well visible dent on the working edge of the sword, near its tip. The most intriguing question: Who might have used this sword? The blade itself has all characteristics of an executioner's sword: a) straight; b) double edged; c) with a round tip. So this is one real possibility. Another -- a less probable -- option, that its owner was a Hussar who wanted an Turkish straight sword, but in this case it is rather difficult to explain the round tip of the blade.