Portuguese cavalry troopers sabre.

[midelburgo]

Juan José Pérez intended to research the Ballesteros enterprise more than 10 years ago. He said so in the esgrima Antigua forum. That forum has had no traffic for five years now. And I did not hear any advance on Ballesteros. I guess it needs some real archival research, go to Toledo trade chamber and breath old papers dust. Nothing IA can do here.
There was a Juan Ballesteros in 1907, who had a shop in Toledo selling swords from the Fabrica and damascened works.
Maybe go to Portuguese army archives and find the contracts for weapon adquisitions.

Something I am thinking just now is that maybe Ballesteros arranged with the Fabrica de Toledo to make the swords there, but produced under his own mark. There is no an easy explanation to have instalations big enough to supply the Portuguese army dissapearing in no time.
One of the swords he made has the same blade as the model called "de tirantes" for Spanish cavalry officers.

Another thing is that Juan Ballesteros (1855 - 1933) did not work on his own until 1899, so his factory cannot be earlier than that.
The advertisement below is from 1916.