Scott 1500 mint sheet 6c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.
Scott 1500 mint sheet 6c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.
Scott 1500 mint sheet 6c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.