Rare Regency TR4 Transistor Radio Circa 1956 - It works! Immaculate Regency TR4 transistor radio - a direct descendant of the Regency TR1 - the first transistor radio ever manufactured - and very similar to the TR1. It is sturdy and in excellent condition, a rarity considering it is around 66 years old...and it works loud and clear! It comes with a top grain medium brown cowhide case, also in excellent condition.  3" x 5" x 1.25".  Radio and case made in the USA!