The 50th anniversary of the invention of a commercially viable incandescent lamp was celebrated with a 2-cent red stamp issued on June 5, 1929. Thomas Alva Edison (1847-1931) invented the product in 1879. The stamp pictures Edison's first lamp above the legend 'Electric Light's Golden Jubilee'. The stamp was printed in three forms: flat plate, rotary press, and rotary press coil with vertical perforations.
- mint; perf 11
- June 5, 1929
- paper; ink (carmine rose); adhesive / engraving
- Height x Width: 1 x 1 in. (2.54 x 2.54 cm)