Red Mercury (newspaper stamp)
| Red Mercury | |
|---|---|
| Country of production | Austria |
| Date of production | 1856 |
| Nature of rarity | Few exist |
| No. in existence | unknown |
| Face value | 6kr – 30 centesimi |
| Estimated value | US $40,000 |
The Red Mercury—Zinnoberrote Merkur, lit. "vermilion Mercury"—is the rarest of Austrian newspaper stamps. It was issued for the mailing of newspapers in Austria and Lombardy-Venetia.