DCHP-1 Online
Brock copper [< General Sir Isaac Brock, 1769-1812, British Commander-in-Chief in Upper Canada] Hist. 
a copper coin, worth about a farthing, that circulated in Canada after the War of 1812 until stopped by law because an influx of American counterfeit coins rendered them worthless.
See also: Wellington copper
- 1819 We, the subscribers, will receive, as small change, the various species of Coppers, which have heretofore been current here, except those denominated Brock Coppers, and Waterloo coppers.
- 1848 The old "Brock" and "Wellington" coppers are familiar to the recollection of the old settlers; they once formed our only copper circulation although 4 or 5 of them would not balance a British penny!
- 1819 We, the subscribers, will receive, as small change, the various species of Coppers, which have heretofore been current here, except those denominated Brock Coppers, and Waterloo coppers.