As far as I know, the Chilean Mausers were all 7x57. To be 100% certain (and to make certain the chamber wasn't reamed out to fire some other cartridge), take it to a gunsmith have have them take precise chamber and bore measurements.
It is most likely the makers stamp although it is hard to tell without seeing it properly.
I have 2 boxes I will sell. precars@aol.com 11/25/2008 buffaloarms.com has this ammo.
Lothar Loewe was born on February 9, 1929, in Berlin, Germany.
Most of these rifles were shipped to South America. I should have the countries "crest" on the top of the receiver ring. Look at it closely and tell me what you see.
Provide a detailed description of all markings, finish, barrel length, finish on all parts of the rifle and type of finish on the stock.
Frederick Loewe's birth name is Loewe, Fritz.
Carl Loewe's birth name is Johann Carl Gottfried Loewe.
Wilhelm Loewe died in 1886.
Wilhelm Loewe was born in 1814.
Ludwig Loewe was born in 1837.
Ludwig Loewe died in 1886.
Loewe AG was created in 1923.