Q:How do I Identify my Blaupunkt radio?
A: Blaupunkt radios were manufactured with a series designation and a serial number. The easiest way to tell the approximate age of a Blaupunkt radio is by the series designation, as:
This letter designation is usually found on a "paper" tag/label affixed to the side of the radio. The letter usually is in front of the serial number. It appears from the information I have, that the first part transistor Blaupunkt radios were introduced in 1958-59, with the Koln TR US. This radio would have been mostly tubes, with one or two transistors. In 1959-1960 the Frankfurt TR US appeared, and the conversion to all transistor was completed sometime around 1965. Just a tidbit from an accumulation of information that I have gathered together about Blaupunkt and Becker radios.