7.65 x 53 Belgian Mauser


Recently found at SLICS…
Cartridges within have browned case, headstamp U.M.C. 7.65 M/M
Were these made for one of the countries in South America that used this caliber ??..These would date from about 1914
The overlabel states: 4,000 Atmospheres 58,800 Lbs. Pressure

Thanks for any info !!