100 Dollars / Piastres

The Montreal Bank — later renamed the Bank of Montreal — was chartered in 1817, making this one of the earliest notes issued by what would become Canada's oldest chartered bank. In 1818 the institution had barely begun operations, and notes of this denomination were essentially instruments of commercial credit between merchants, not everyday currency. High-denomination notes from infant colonial banks rarely left the hands of a small circle of traders and correspondents.

Surviving examples from this first emission are exceptionally rare. The PS prefix in the reference signals its listing under obsolete North American bank issues, and the DA suffix typically denotes a proof or specimen variant — worth confirming against the archive record before cataloging as an issued note.