This is a very inusual an interesting box of modified 11,15 x 60 R Mauser cartridges for .43 Spanish Remington rifles. The entire box was opened and re-sealed with white paper covering the original German label (now only barely visible) and a new US style label was added on the opposite side reading: “CENTRAL FIRE AMMUNITION - 20 METALLIC CARTRIDGES - FOR - SPANISH REMINGTON - These shells can be reloaded many times”.
The cartridges inside looks like normal arsenal reloads with flat nose bullet without paper patch, but the rim of the cases was enlarged by compression and now measures 15.55 to 15.91 mm (.612 to .626"). The original Mauser rim measured c. 15 mm (.590") while the .43 SR rim is about 15.75-16.30 mm (.620-.641"). There are many different headstamps inside with dates between 1876 and 1888.
I’ve seen only three of these boxes in Argentina, two of them sealed and full of modified cartridges and one empty. I wonder who made these labels and modified the cartridges; maybe it was done by a US surplus ammunition dealer or maybe it was done here in Argentina? Does anyone have similar 11 mm Mauser cartridges with enlarged rims?