The Sanyo RD-5503 is a cassette tape deck that was produced between 1980 and 1982 in Japan. It is part of the Sanyo System 5503, a complete audio system designed for home use. The deck showcases the company's commitment to quality audio reproduction during that era. Users would find the RD-5503 integrated into various Sanyo audio systems alongside components like tuners and amplifiers, thereby contributing to a full audio experience. This model was positioned in a mid-range market segment, reflecting a balance of performance and price. The original price of the complete system was approximately 1,798 DM, indicating a significant investment for consumers seeking a versatile audio setup.