Hi, I'm not sure if you ever got an answer to your question on the radio. I recently purchased an 85 jalpa, included in the paper work, owners manual and documentation is the stereo manual identifying it as an alpine 7145e. The manual is in several languages and also included a factory registration card that could be mailed back to alpine with the serial number. I am pretty confidant this is the original and standard for that year. It is a.m. / f.m. casset.
If their is any otrher info I can provide let me know
john