No. 1840 / uniform penny ledger
Crown Post Gazette
line-engraved proof issue

Carbon-black intaglio proof

Ink Makes Distance Ordinary

A postal archive cover built from dense carbon fields, toned paper lettering, guilloche security lines, and one documented red cancellation mark.

POSTAGE wide engraved capitals
ONE PENNY flat rate made visible
CHECK AA corner letters and rules
POSTAGE 1840 ONE PENNY A A
This is the Penny Black Stamp design system, applied by Curio Design — a design-style library for AI agents. Full Penny Black Stamp guide → designbycurio.com/learn/penny-black-stamp-1840