1 Peso

Banco Internacional was a short-lived Mexican private bank, one of several regional institutions authorized to issue notes during the Porfiriato — a period when Díaz's government deliberately fragmented banking privileges to limit any single institution's power. The American Bank Note Company handled virtually all serious Mexican private bank printing in this period; New York-engraved plates were the norm for any institution wanting its notes treated as credible.

S-prefix placement in Pick puts this squarely in the unissued or regionally limited category. Whether notes from this bank reached meaningful circulation before the 1884–85 banking consolidations is genuinely unclear.