Iconic original Sony TPS-L2 Walkman, serial no. 263022, measuring approximately 3.5″ x 5.5″ x 1″, featuring the text, "Sony Stereo Cassette Player TPS-L2" across the top, with the original "Walkman" logo adhesive label at the bottom. This was the first portable cassette player released under the 'Walkman' name, featuring stereo audio, two headphone ports allowing simultaneous listening, and a 'hotline' button with small microphone allowing the two listeners to converse without removing their headsets; the original Sony MDR-3L2 headphones are included, as issued with the Walkman. Created by Sony co-founders Akio Morita and Masaru Ibuka, along with Kozo Ohsone, the metal-cased blue-and-silver Walkman TPS-L2, went on sale in Japan on July 1, 1979, selling more than 30,000 units in its first two months; it was introduced in the U.S. In the UK in June 1980.
