[captainclock1988]

I found a website that explained the Zenith Model Number ID System and how it worked, apparently the first digit of the model number was the number of tubes the radio had in it (which I already knew that from reading it in a post on another electronics forum) and the second character (the letter in the middle of the model number) told you what kind of radio it was and what voltage(s) it could run on (whether or not it was an AC Only set or AC/DC set or if it had FM on it or if it was AM and shortwave or AM Only or if it was a battery set or if it was a 32V Farm Set, etc. the first digit of the last 2 or three digits of the final character string of a Zenith model number identified the model year of the radio and the last two digits referred to what kind of cabinet the radio was, which the middle and last two or three characters of the model number string I didn't know about, I just knew about the first number of the model number referring to the tube count and that was it. It is interesting to point out that the 6R687R radio was apparently a fairly high end radio for its time and thus why it is there aren't many of them left anymore, because it probably was a rare model to begin with because it was probably in a fairly high price point, and so not many people bought one for that reason. It apparently had a Solid Mahogany Cabinet which was probably part of why it was considered a fairly high end unit despite it being an AM Only radio with a 78 RPM Only Record Changer.