It was purchased by Brazilicon between 1922-1924 from FN. Supposedly for artillery/calvary troops. Unknown the total number purchased. As with a lot of short rifles/carbines from Brazil many were used hard and are found in similar condition like yours. The straight grip stock on yours is correct. Nice rifle, I really like the Brazillian Mausers and the amount of different varieties they have. I'm sure it will clean up well.