This is the same as the previous ESR/C radio but they added a manual cassette eject button. These started showing up around 1996 and replaced the ESR/C with the electronic cassette eject button. Functionality was the same and actually are compatible with each other.
Just like it's predecessor, you can find these in both premium and non-premium versions.
These have 19B132 in the part numbner.
Operating guide for the ESR/C Manual radio
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