That is always the big question for me when I see pieces like this. Unfortunately there appears to be very little evidence available to us at this time to really pin down concrete dates for these things. The "Boxer" uprising era is a convenient term often used when describing many Chinese weapons found today, but I think its use is less than accurate. The fact that broad western world attention was being focused on China at that time, and related photographic evidence is available because of that attention lends itself to the c.1900 labels given to many of these types of swords. That being said, I am going to propose a more liberal estimation of its age 1860-1920.
I have also attaches an interesting image below of an old postcard. I am not sure of its exact date. Although its makers were active in Shanghai from 1898-1919.