58 meigs-madrid

Hi all,
Do any of you know why this 58 MEIGS is called Madrid? is it of Spanish manufacture?
Thank you


IIRC this ctg was for the Spanish Berdan conversion.

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How long is the case? I know that spain used a .58 berdan cartridge with a 41mm long case.

Left 58 Spanish Berdan, rigth 58 Meigs-Madrid