Hi,
Just bought a small set of original DWM company correspondence, dating from february, 1903.
They discuss a batch of Mauser 1893 service rifles and ammunition that was left over from the Spanish-American war. The Greek consul in Berlin inquired about the quality of these rifles at the DWM office in Berlin, as Greece was interested in buying the lot.
This documentation has the famous 'Parabellum' letterhead: