Probably for a Variation of the Marshal (British) Tractor Engine starter.
Argentina in the early part of the 1900s (up to WWII) was a big user of all sorts of British-made agricultural machinery.
The carboard “rim” could be a simple “holding rim” for an ignition chamber which was connected in a reverse manner to the normal Marshall system ( drop in cartridge, screw FP cap on, hit FP with hammer–Bang–Engine turns over.)
THis Modified system could have used an entire Front Loading chamber, which screwed onto the Ignition duct/cylinder head, and the shell had to have the rim removed to place the primer against the firing Pin. Then the entire assembly was screwed/bolted onto the Cylinder head, and fired.
When the Firing chamber was removed, the shell could be Picked out, or Fall out, and a new one fitted. The card wad “rim” with the central hole helped vent the flash into the cylinder, or it just served to place the shell in the chamber; Most likely it disintegrated on firing.
Interesting “Home grown” variety…probably a shortage of British made original shells during WW II brought out this “conversion”.
Regards, Doc AV