100 Lire Banca Agricola Commerciale della Repubblica di San Marino

San Marino's domestic banking sector operated under arrangements that allowed the republic's institutions to issue instruments denominated in lire while remaining outside the Bank of Italy's direct regulatory framework — a consequence of the 1939 customs union treaty with Italy rather than any formal monetary autonomy. The Banca Agricola Commerciale occupied a specific niche within that arrangement, serving primarily the agricultural and commercial credit needs of a microstate whose entire territory sits within Emilia-Romagna.

MICR encoding on a 1977 San Marino issue is worth noting — its inclusion reflects alignment with Italian interbank clearing standards of the period, suggesting these instruments were processed through the wider Italian banking infrastructure despite their distinct issuer.