20 Dollars British Guiana Bank

The British Guiana Bank was a short-lived colonial institution that ceased operations in the early twentieth century, and notes from this period survive almost exclusively in cancelled form — the perfin cancellation punched through the paper being the standard method of retirement rather than destruction. That practice is the reason any example exists at all; uncancelled survivors would be extraordinary.

Perkins Bacon had long experience printing currency and postage stamps for British colonial territories, their intaglio work generally holding up well under tropical conditions. British Guiana's humid climate was notoriously hard on paper issues.