Consular Fifty Kopeck, Inverted Center

Russian Soviet Federative Socialist Republic · 1922 · 50 kopecks

This airmail stamp, intended for mail from the RSFSR consulate in Berlin to Moscow, features a prominent numeral '50' within an ornate frame. It is famous for a rare printing error where the central numeral design was printed upside down relative to the frame. This inverted center error makes it one of the most sought-after rarities in Russian philately.

Issued during the early years of the Soviet state, this stamp represents the efforts to establish reliable airmail services. The error occurred during a period of significant political and social transition in Russia.