I have a Chilean Mauser I bought from a self-described collector abut 25 years ago. The 25 year old tag he had on it at the gunshow where I bought it states it is a "95/12". If he told me what the /12 signifies I do not remember. I am getting ready to sell it and want to clear up something. All the numbers match -bolt, wood, cleaning rod - except for the 3 rear sight pieces. I believe some military rifles had rear sights with updated calibration to better match ballistics of a newer ammunition. When Chile adopted the 1912 Mauser, made by Steyr, was a new ammunition type also approve(maybe to take advantage of the 1912's model 98-type stronger action?) I am guessing here, but was my 1895 model refitted with a new, different (non-matching) rear sight calibrated to ballistics of the updated ammo? If so, the "/12" model designation for my rifle makes sense. I am not trying to answer my own question, just lay out some possibilities as background.
thank you to everyone who can comment on this.
The main change that countries made around that time was to lighter, pointed bullets instead of round-nosed heavier ones.
That's what required sight changes.