Found some early 7mm Mauser cartridges & clip

[RCS]

Some years ago a bought a small collection of US cartridges from a small gun store, all of these cartridges were from the 1890 to 1914 time period. there was 30-03 in five round clips , early 30-40 Krag including blank, dummy guard loads and early 38 Colt and 45 cal Model 1909 cartridges too. Very early 30-06 and 30-06 converted from 30-03 were most interesting, but among all these US "turn of the century" cartridges was a single clip of 7x57mm Mauser from Spain. Makes you wonder how and why this 7mm clip got into this collection ?