Issued on June 5, 1929, this 2-cent stamp commemorates the golden jubilee of the invention of the first commercially practical incandescent light bulb by Thomas Edison. The First Day of Issue ceremony was held in Menlo Park, New Jersey, the site of this historic achievement. The stamp depicts the iconic bulb with its glowing filament. While many inventors had experimented with electric lighting, Edison's breakthrough in his Menlo Park laboratory was the development of a long-lasting and affordable light bulb, which was part of a complete system of electricity generation and distribution. The successful test of a carbonized bamboo filament that could last for over 1200 hours made widespread electric lighting a reality. This stamp not only honors a specific invention but also the innovative spirit of Edison's "invention factory" in New Jersey, a place that became synonymous with technological progress.
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