50 Pounds Bank of Australasia

The Bank of Australasia was a British-chartered institution headquartered in London, which is why its high-denomination notes were engraved and printed there rather than in the colonies where they actually circulated. Perkins, Bacon & Petch were the dominant security printers of the mid-Victorian period, responsible for much of the British Empire's paper currency and postage stamps — their siderographic process, which transferred engraved designs via hardened steel rollers, produced unusually fine detail resistant to counterfeiting.

A £50 face value placed this note well outside everyday commerce. It functioned primarily in interbank settlement and large mercantile transactions across the Australian colonies, where the Bank of Australasia operated branches from the 1830s onward.